Best iSpring Reverse Osmosis Systems: 15 Models Compared
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Finding the best iSpring reverse osmosis systems requires looking at the full range of options available for your home. This list covers 15 models, ranked strictly by their published specifications. iSpring offers under-sink RO units, countertop filters, whole-house UV disinfection, and specialized alkaline or deionization systems. The iSpring RCC7-BN 75 GPD Under Sink RO leads as the best overall choice for verified contaminant removal in compact spaces. We compared capacity, filtration stages, and physical dimensions to help you select the right system.
Quick picks
Our 15 picks
iSpring RCC7-BN 75 GPD Under Sink RO
Best for: Verified contaminant removal in compact spaces
- Filtration Stages
- 5
- Capacity (GPD)
- 75
- Design
- Under sink
- Certification
- NSF/ANSI 58
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
The iSpring RCC7-BN is an under-sink reverse osmosis system rated at 75 gallons per day. It uses five filtration stages to remove up to 99% of contaminants, including lead and PFAS. The unit is NSF/ANSI 58 certified and features a compact footprint measuring 15 by 8 by 18 inches. It requires no power source and includes a lead-free faucet. This model suits households needing reliable, certified drinking water filtration.
Pros
- NSF/ANSI 58 certified for contaminant reduction
- Removes up to 99% of over 1,000 harmful contaminants
- Compact design fits under most kitchen sinks
- Requires no external power source
Cons
- 75 GPD capacity is lower than tankless 300+ GPD models
- Includes a storage tank, taking up more cabinet space
- No alkaline remineralization stage included
Good fit if
- You need NSF/ANSI 58 certification for verified contaminant removal
- You have limited under-sink space for a compact system
- You want a standard 5-stage reverse osmosis setup
Skip if
- You require instant high-flow water without a storage tank
- You prefer alkaline or remineralized water output
- You need a capacity exceeding 75 gallons per day
Verdict: iSpring RCC7-BN 5-Stage 75 GPD RO delivers certified, compact filtration for standard household needs. It is the right fit for buyers prioritizing verified contaminant removal and space efficiency over high flow rates.
iSpring T20M 20 Gallon RO Storage Tank
Best for: high-volume household water storage
- Certification
- Tested to meet NSF and ANSI Standards
- Dimensions
- 16 × 16 × 30 inches
- Weight
- 32 pounds
The iSpring T20M is a 20-gallon pre-pressurized storage tank for reverse osmosis systems. It holds 14 gallons of usable water and meets NSF and ANSI standards. The unit measures 16 by 16 by 30 inches and weighs 32 pounds. You can place it vertically or horizontally. It includes a shut-off valve, tank connector, and stand. This tank suits homes needing high daily water volume.
Pros
- 20-gallon total size with 14 gallons storage
- Tested to meet NSF and ANSI Standards
- Includes shut-off valve, connector, and stand
- Flexible vertical or horizontal installation
Cons
- Large 30-inch height requires significant clearance
- 32-pound weight needs sturdy mounting
- Only stores 14 gallons of usable water
Good fit if
- You need high daily water output
- You have space for a large tank
- You want NSF certified components
Skip if
- You have limited under-sink space
- You prefer tankless systems
- You cannot support heavy weight
Verdict: iSpring T20M 20-Gallon RO Tank fits households with high water usage and ample storage space. It provides reliable capacity for families who need consistent access to filtered water without waiting for production.
iSpring US31-NC Under Sink Filter
Best for: fast flow chloramine removal
- Design
- Under sink
- Certification
- NSF/ANSI 58, NSF 42
- Contaminants Removed
- Chloramine, chlorine, sediment, VOCs
- Installation Type
- Under sink
- Filtration Stages
- 3-Stage
- Features
- Sediment Filter
The iSpring US31-NC is a 3-stage under sink water filter designed for chloramine reduction. It uses NSF/ANSI 58 certified cartridges and SGS-tested catalytic carbon to remove sediments, VOCs, and chlorine. You get a high flow rate of up to 5 GPM and a capacity of 10,000 gallons. The clear housing lets you see trapped particles, and the faucet mounts from above for easy installation. It retains beneficial minerals rather than lowering TDS.
Pros
- NSF/ANSI 58 certified filtration for safety
- High flow rate up to 5 GPM
- 10,000-gallon capacity or 12 months of use
- Clear housing shows captured contaminants
- Top-mount faucet installation avoids under-sink crawling
Cons
- Only 3 filtration stages compared to 5-stage RO systems
- Does not remove dissolved solids or lower TDS
- No water storage tank included
Good fit if
- You need fast water flow for cooking
- You want to reduce chloramine without removing minerals
- You prefer easy top-mount faucet installation
Skip if
- You need reverse osmosis purification
- You want to remove dissolved solids
- You require a 5-stage filtration system
Verdict: The iSpring US31-NC Under Sink Filter offers high flow and certified chloramine removal for those who want mineral-rich water. It fits kitchens where speed and easy installation matter more than total purification.
iSpring RCC7P-AK Alkaline RO
Best for: Low pressure homes wanting alkaline water
- Filtration Stages
- 6-Stage
- Filtration Type
- Reverse Osmosis, Alkaline
- Installation Type
- Under Sink
- Features
- Alkaline Filter, Booster Pump
- Use
- Drinking Water
- Dimensions
- 14.5 × 5.25 × 19 inches
This iSpring system combines a booster pump with alkaline remineralization for under-sink installation. The six-stage process reduces over 1,000 contaminants, including lead and PFAS, while the final stage balances pH for a natural taste. The durable electric pump ensures consistent performance even in homes with low water pressure. Weighing 20 pounds, it fits standard under-sink spaces and includes a transparent housing for easy filter monitoring.
Pros
- Six-stage filtration reduces over 1,000 contaminants including lead and PFAS
- Booster pump ensures high efficiency in low-pressure homes
- Alkaline stage restores minerals and balances pH for better taste
- Transparent first-stage housing allows easy monitoring of filter condition
Cons
- Requires electrical outlet for the booster pump operation
- Heavier build at 20 pounds compared to tankless alternatives
- Limited to drinking water use, not whole house filtration
Good fit if
- You have low water pressure and need a booster pump
- You prefer alkaline, remineralized water over standard RO output
- You want transparent housing to easily check filter status
Skip if
- You need a tankless system to save under-sink space
- You want whole house filtration for all home water uses
- You cannot install an electrical outlet near the sink
Verdict: iSpring RCC7P-AK 6-Stage Alkaline RO suits households with low water pressure that also want improved taste through alkaline remineralization. It delivers reliable contaminant reduction while requiring an electrical connection for its pump.
iSpring RO500-BN Tankless RO System
Best for: High-volume under-sink filtration without tanks
- Capacity (GPD)
- 500 GPD
- Design
- Tankless
- Pure to Drain Ratio
- 2:1
- Certification
- NSF 58
- Filtration Type
- Reverse osmosis
- Features
- Automatic self cleaning mode
The iSpring RO500-BN is a tankless reverse osmosis system designed for under-sink installation. It produces 500 gallons per day with a flow rate of 0.4 gallons per minute. NSF 58 certification confirms its ability to reduce total dissolved solids. The unit features a 2:1 pure-to-drain water ratio and an automatic self-cleaning mode for the membrane. Its compact, tankless design saves space compared to traditional storage tank systems.
Pros
- NSF 58 certified for TDS reduction
- 500 GPD capacity with 0.4 GPM flow rate
- 2:1 pure-to-drain water ratio
- Automatic self-cleaning membrane mode
- Tankless design saves under-sink space
Cons
- No alkaline remineralization stage included
- No built-in water pump for low pressure
- Requires 8 inches of width clearance
Good fit if
- You need high daily output without a storage tank
- You want NSF 58 certification for contaminant reduction
- You prefer a compact under-sink footprint
Skip if
- You require alkaline or remineralized water
- You have very low incoming water pressure
- You need a countertop or whole-house system
Verdict: The iSpring RO500 Tankless RO System delivers fast, certified filtration for households needing high volume without tank storage. It fits best in kitchens with adequate width clearance and standard water pressure.
iSpring UVF20 Whole House UV System
Best for: high-flow whole house disinfection
- Design
- Whole house
- Installation Type
- Whole house
- Features
- Automatic flow sensor
- Capacity
- 12 GPM
- Dimensions
- 3.3 × 5.5 × 14.2 inches
- Weight
- 3.4 pounds
The iSpring UVF20 is a whole house ultraviolet water filter designed for high flow rates up to 12 GPM. It uses a mercury-free LED UV module rated for 8,000 hours, eliminating the need for bulb replacements for up to 11 years. The unit features a built-in automatic flow sensor that activates only when water is in use. This system reduces microorganisms by 99.99% and installs downstream of your main filtration system.
Pros
- Supports flow rates up to 12 GPM for whole house coverage
- LED UV module rated for 8,000 hours with no bulb replacement needed
- Built-in automatic flow sensor activates only during water use
- Mercury-free design with no warm-up time required
Cons
- Provides UV disinfection only, lacking additional filtration stages
- Requires installation downstream of a separate whole-house filter
- No remote monitoring or app connectivity listed
Good fit if
- You need high flow capacity for multiple fixtures
- You want a maintenance-free UV system without bulb changes
- You already have a primary filtration system
Skip if
- You need a complete filtration system without additional components
- You require smart home integration or remote control
- You have low flow demand under 5 GPM
Verdict: The iSpring UVF20 Whole House LED UV is a high-flow disinfection unit for homes with existing filtration. It suits buyers prioritizing long service life and instant activation over multi-stage purification.
iSpring PH100 100 GPD Alkaline RO
Best for: alkaline remineralization and low waste
- Filtration Stages
- 6
- Capacity (GPD)
- 100
- Pure to Drain Ratio
- 1:1
- Filtration Type
- Reverse osmosis, alkaline
- Installation Type
- Under sink
- Capacity
- 100 GPD
The iSpring PH100 is a 6-stage under-sink reverse osmosis system with a 100 GPD capacity. It features a Dupont membrane and an alkaline remineralization filter to improve taste and pH balance. The unit offers a 1:1 pure-to-waste water ratio and uses quick-fit connectors for installation. It includes a brushed nickel faucet and fits under standard sinks. This system suits you if you want balanced alkalinity without excessive water waste.
Pros
- 6-stage filtration with alkaline remineralization
- 1:1 pure-to-drain water ratio
- 100 GPD output capacity
- Dupont RO membrane for durability
Cons
- Lower 100 GPD capacity compared to high-flow models
- Requires under-sink cabinet space
- No built-in storage tank listed
Good fit if
- You want alkaline, remineralized water
- You prefer a 1:1 waste ratio
- You have space under a standard sink
Skip if
- You need high-volume water for ice makers
- You require a tankless design
- You want whole-house filtration
Verdict: The iSpring PH100 Alkaline 6-Stage RO delivers balanced, remineralized water with efficient 1:1 waste ratios. It fits well in standard under-sink spaces for households prioritizing taste and pH balance over high-volume output.
iSpring RO800G Tankless 800 GPD
Best for: high-demand households needing fast tankless filtration
- Capacity (GPD)
- 800
- Design
- Tankless, under sink
- Pure to Drain Ratio
- 2.5:1
- Filtration Type
- Reverse osmosis
- Micron Rating
- 0.0001 microns
- Capacity
- 800 GPD
The iSpring RO800G is a tankless under-sink reverse osmosis system designed for high-demand households. It produces 800 gallons per day with a flow rate of 0.6 GPM. The unit features a 2.5:1 pure-to-drain ratio for water efficiency. Two-stage filtration removes sediment, chlorine, and impurities down to 0.0001 microns. Its compact 6.5-inch depth fits neatly under most sinks without a storage tank.
Pros
- 800 GPD capacity for high daily water usage
- Tankless design saves under-sink space
- 2.5:1 pure-to-drain water-saving ratio
- 0.6 GPM fast flow rate
- Two-stage filtration removes TDS and heavy metals
Cons
- No built-in remineralization or alkaline stage
- Not recommended for refrigerator or ice maker connection
- Requires under-sink installation only
Good fit if
- You need high daily water volume for a family or office
- You want to save space by avoiding a storage tank
- You prioritize water efficiency with a low drain ratio
Skip if
- You require remineralized or alkaline water directly from the system
- You need to connect the filter to a refrigerator or ice maker
- You prefer a countertop unit that requires no plumbing
Verdict: The iSpring RO800G 800 GPD Tankless RO is a high-capacity, space-saving solution for households that need fast, efficient water filtration without the bulk of a storage tank.
iSpring RCC7P 75 GPD RO System
Best for: Low pressure homes needing consistent flow
- Filtration Stages
- 5
- Capacity (GPD)
- 75
- Design
- Under sink
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
- Features
- Electric booster pump
This iSpring RCC7P is a 5-stage under sink reverse osmosis system with a 75 GPD capacity. It includes an electric booster pump to maintain consistent performance regardless of inlet pressure variations. The design features a brushed nickel faucet and clear first-stage housing for easy filter inspection. It reduces up to 99% of over 1,000 contaminants. You should choose this if you need stable flow rates in low-pressure environments without a storage tank.
Pros
- Electric booster pump ensures consistent throughput
- 75 GPD capacity for daily drinking water
- 5-stage filtration reduces 99% of contaminants
- Clear first-stage housing for easy inspection
Cons
- Requires electrical outlet for the booster pump
- No built-in storage tank included in this model
- Limited to 75 GPD compared to higher-capacity tankless options
Good fit if
- You have low incoming water pressure
- You want consistent flow without a large tank
- You need easy filter visibility
Skip if
- You do not have an electrical outlet under the sink
- You need more than 75 GPD daily
- You prefer a tankless system with higher capacity
Verdict: iSpring RCC7P 75 GPD Under Sink RO suits homes with low water pressure that need reliable, pump-assisted filtration without the bulk of a storage tank.
iSpring RCC7D 75 GPD RO/DI
Best for: aquariums and laboratory ultra-pure water needs
- Filtration Stages
- 5
- Capacity (GPD)
- 75
- Design
- Under sink
- Filtration Type
- Reverse osmosis, deionization
- Installation Type
- Under sink
- Capacity
- 75 GPD
The iSpring RCC7D is an under-sink reverse osmosis and deionization system with a 75 GPD capacity. It uses five filtration stages to remove dissolved solids, chlorine, fluoride, and lead. This setup produces ultra-pure water suitable for aquariums, labs, and medical facilities. It is not recommended for drinking due to the lack of minerals. The unit fits under sink cabinets and requires 45-70 psi incoming pressure.
Pros
- Combines reverse osmosis with deionization for ultra-pure water
- Removes up to 98% of lead and other dissolved solids
- 75 GPD production capacity for consistent output
- Compact under-sink design fits standard cabinets
Cons
- Not recommended for drinking water consumption
- Requires incoming water pressure between 45 and 70 psi
- Maximum input TDS limited to 750 ppm
Good fit if
- You need ultra-pure water for aquariums or reef tanks
- You require deionized water for laboratory or medical use
- You want to remove dissolved solids from well or city water
Skip if
- You want to drink the filtered water directly
- Your incoming water pressure is below 45 psi
- Your source water TDS exceeds 750 ppm
Verdict: The iSpring RCC7D 75 GPD RO/DI System is ideal for users needing ultra-pure water for technical or aquatic applications rather than daily drinking.
iSpring RCD100 Countertop RO System
Best for: renters needing hot filtered water without plumbing
- Filtration Stages
- 5
- Capacity (GPD)
- 100 GPD
- Design
- Countertop
- Pure to Drain Ratio
- 2.5:1
- Filtration Type
- Reverse osmosis with UV
- Installation Type
- Countertop
The iSpring RCD100 is a countertop reverse osmosis system designed for easy setup without plumbing. It produces 100 GPD of filtered water and includes instant hot water dispensing with four temperature settings. The unit features a 2.5:1 pure-to-drain ratio and built-in UV filtration. Its compact footprint fits on counters in kitchens, offices, or RVs, making it suitable for small to medium households seeking convenient, contaminant-reduced water.
Pros
- No plumbing installation required; plug-and-play design
- Instant hot water with four temperature modes
- Built-in UV light for added protection
- 2.5:1 pure-to-drain water ratio
- Smart panel with filter life monitoring
Cons
- 100 GPD capacity is lower than under-sink models
- Intended for city water only, not well water
- Requires a power outlet for operation
Good fit if
- You cannot modify existing plumbing or drill holes
- You need hot water for coffee or tea directly from the filter
- You want a portable solution for offices or RVs
Skip if
- You require high-volume water for large families
- You rely on well water sources
- You prefer a hidden under-sink installation
Verdict: The iSpring RCD100 Countertop RO with Instant Hot fits renters or office users who need hot water and clean drinking water without permanent installation. Its portable design and instant heating features make it ideal for spaces where plumbing changes are not possible.
iSpring RCB3P 300 GPD Tankless RO
Best for: Light commercial sites needing 300 GPD output
- Capacity (GPD)
- 300
- Design
- Under sink, tankless
- Pure to Drain Ratio
- 1.5:1
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
- Micron Rating
- 0.0001
This under-sink reverse osmosis system delivers up to 300 gallons per day with a 1.5:1 pure-to-drain ratio. It features an integrated booster pump and a 0.0001-micron membrane mounted on a freestanding stainless steel frame. It gives you high-volume production for light commercial spaces, offices, or busy homes that do not require an included pressurized tank.
Pros
- High 300 GPD production rate
- 1.5:1 pure-to-drain wastewater ratio
- Built-in booster pump to raise feed pressure
- Freestanding stainless steel frame and mounting bracket
Cons
- Storage tank is not included
- Heavy build weighing 52 pounds
- Tall 28-inch frame requires significant cabinet clearance
Good fit if
- You need up to 300 gallons of filtered water daily for light commercial or high-demand residential use.
- You have vertical under-sink space to accommodate a 28-inch tall freestanding unit.
Skip if
- You want an all-in-one system that includes a storage tank in the box.
- You have limited under-sink space unable to fit a 52-pound frame.
Verdict: iSpring 300 GPD Tankless Reverse Osmosis System provides high-volume filtration and booster pump pressure for offices, salons, and demanding households. It serves spaces with sufficient vertical clearance that either operate tankless or connect to separate storage.
iSpring US31KF Under Sink Filter
Best for: chlorine removal and mineral retention
- Filtration Stages
- 3
- Design
- Under sink
- Filtration Type
- Carbon block
- Contaminants Removed
- Chlorine
- Installation Type
- Under sink
- Features
- Chlorine Reduction, Sediment Filter
The iSpring US31KF is a 3-stage under sink water filter designed for deep chlorine removal. It uses classic 2.5x10-inch carbon block filters to extend contact time and improve taste. The system retains healthy minerals and does not lower TDS. It features transparent housings for visual monitoring and connects via standard 3/8-inch fittings without drilling. This unit suits users seeking reliable, long-term filtration with low ongoing costs.
Pros
- True 3-stage carbon block design for thorough chlorine reduction
- Transparent housings allow real-time visual monitoring of filter condition
- Reusable housing reduces plastic waste compared to twist-on cartridges
- Connects to existing cold water supply without drilling or extra faucets
- Retains beneficial minerals while removing contaminants
Cons
- Does not remove dissolved solids or heavy metals
- Requires more installation effort than twist-on disposable filters
- Only reduces chlorine, not other contaminants like lead or cysts
Good fit if
- You want to improve taste and odor by removing chlorine
- You prefer a system that retains healthy minerals in your water
- You want to avoid drilling holes in your countertop
Skip if
- You need a system that removes dissolved solids or heavy metals
- You want a tankless reverse osmosis system
- You prefer a simple twist-on cartridge with no installation effort
Verdict: The iSpring US31KF Under Sink Filter is a practical choice for households focused on chlorine reduction and mineral retention without the complexity of reverse osmosis. It fits well in kitchens where you want to avoid drilling and prefer a transparent, maintainable system.
iSpring RCC1UP 100 GPD Under Sink RO
Best for: High-volume needs with UV protection
- Filtration Stages
- 6
- Capacity (GPD)
- 100
- Design
- Under sink
- Filtration Type
- Reverse osmosis, UV
- Installation Type
- Under sink
- Features
- Booster pump, UV filter
This under sink reverse osmosis system combines six filtration stages with an ultraviolet light. It produces 100 gallons per day and includes a booster pump for consistent flow. The UV filter operates automatically with water flow, requiring an electrical outlet. You get a 0.0001 micron membrane to remove contaminants like lead and PFAS. The unit fits under standard sinks and uses quick-connect tubing for installation.
Pros
- 100 GPD daily capacity
- Integrated UV filtration stage
- Booster pump for steady flow
- Reduces up to 99% of contaminants
- Quick-connect tubing installation
Cons
- Requires an electrical outlet for UV function
- Heavier at 35 pounds
- Larger footprint than tankless models
Good fit if
- You need higher daily output than 75 GPD
- You want added UV sterilization
- You have space under the sink
Skip if
- You lack an electrical outlet nearby
- You prefer tankless designs
- You need under 100 GPD
Verdict: iSpring RCC1UP 100 GPD UV RO System suits households needing reliable high-volume water with added UV protection. It works best where power is available and space allows for its under-sink footprint.
iSpring RCC7AK-UVF3 7-Stage Under Sink
Best for: advanced under-sink purification with UV
- Filtration Stages
- 7
- Design
- Under sink
- Certification
- NSF/ANSI 58
- Filtration Type
- Reverse osmosis, UV, alkaline
- Installation Type
- Under sink
- Features
- Alkaline Filter, UV Filtration
This iSpring system combines reverse osmosis, UV protection, and an alkaline mineral stage for comprehensive under-sink filtration. It is NSF/ANSI 58 certified and includes three extra pre-filters. The design features a top-mounted faucet for easier installation and a transparent housing to monitor filter condition. It reduces TDS, PFAS, chlorine, and heavy metals. This setup suits households seeking advanced multi-stage purification with added UV disinfection.
Pros
- NSF/ANSI 58 certified system
- Includes 3 extra pre-filters
- Built-in UV water filter
- Alkaline mineral boost stage
- Top-mounted faucet design
Cons
- Heavier build at 29 pounds
- Larger footprint than tankless models
- Requires electrical power for UV light
Good fit if
- You want UV protection alongside RO filtration
- You prefer easy top-mounted faucet installation
- You need NSF/ANSI 58 certification
Skip if
- You need a tankless system to save space
- You do not have an electrical outlet under the sink
- You prefer a lighter unit for easier handling
Verdict: iSpring RCC7AK-UVF3 7-Stage RO System offers robust multi-stage filtration with UV disinfection and mineral enhancement. It fits buyers who prioritize certified contaminant reduction and convenient installation over compact tankless designs.
Specifications side by side
| Spec | iSpring RCC7-BN 75 GPD Under Sink RO | iSpring T20M 20 Gallon RO Storage Tank | iSpring US31-NC Under Sink Filter | iSpring RCC7P-AK Alkaline RO | iSpring RO500-BN Tankless RO System | iSpring UVF20 Whole House UV System | iSpring PH100 100 GPD Alkaline RO | iSpring RO800G Tankless 800 GPD | iSpring RCC7P 75 GPD RO System | iSpring RCC7D 75 GPD RO/DI | iSpring RCD100 Countertop RO System | iSpring RCB3P 300 GPD Tankless RO | iSpring US31KF Under Sink Filter | iSpring RCC1UP 100 GPD Under Sink RO | iSpring RCC7AK-UVF3 7-Stage Under Sink |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Filtration Stages | 5 | not specified | not specified | 6-Stage | not specified | not specified | 6 | not specified | 5 | 5 | 5 | not specified | 3 | 6 | 7 |
| Capacity (GPD) | 75 | not specified | not specified | not specified | 500 GPD | not specified | 100 | 800 | 75 | 75 | 100 GPD | 300 | not specified | 100 | not specified |
| Design | Under sink | not specified | Under sink | not specified | Tankless | Whole house | not specified | Tankless, under sink | Under sink | Under sink | Countertop | Under sink, tankless | Under sink | Under sink | Under sink |
| Pure to Drain Ratio | not specified | not specified | not specified | not specified | 2:1 | not specified | 1:1 | 2.5:1 | not specified | not specified | 2.5:1 | 1.5:1 | not specified | not specified | not specified |
| Certification | NSF/ANSI 58 | Tested to meet NSF and ANSI Standards | NSF/ANSI 58, NSF 42 | not specified | NSF 58 | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | NSF/ANSI 58 |
| Filtration Type | Reverse osmosis | not specified | not specified | Reverse Osmosis, Alkaline | Reverse osmosis | not specified | Reverse osmosis, alkaline | Reverse osmosis | Reverse osmosis | Reverse osmosis, deionization | Reverse osmosis with UV | Reverse osmosis | Carbon block | Reverse osmosis, UV | Reverse osmosis, UV, alkaline |
| Contaminants Removed | not specified | not specified | Chloramine, chlorine, sediment, VOCs | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Chlorine | not specified | not specified |
| Installation Type | Under sink | not specified | Under sink | not specified | not specified | Whole house | Under sink | not specified | Under sink | Under sink | Countertop | Under sink | Under sink | Under sink | Under sink |
| Features | not specified | not specified | not specified | not specified | Automatic self cleaning mode | Automatic flow sensor | not specified | not specified | Electric booster pump | not specified | not specified | not specified | not specified | Booster pump, UV filter | not specified |
| Micron Rating | 0.0001 | not specified | not specified | not specified | not specified | not specified | not specified | 0.0001 microns | not specified | not specified | not specified | 0.0001 | not specified | 0.0001 | not specified |
| Capacity | 75 GPD | not specified | not specified | not specified | not specified | 12 GPM | 100 GPD | 800 GPD | 75 GPD | 75 GPD | 100 GPD | 300 GPD | not specified | 100 GPD | not specified |
| Use | Drinking Water | not specified | not specified | Drinking Water | not specified | not specified | Drinking Water | not specified | not specified | not specified | not specified | Light Commercial | not specified | Drinking Water | not specified |
| Color | Brushed Nickel Faucet | White - 20 Gallons | Pure White - Plus | Brushed Nickel Faucet | White + Brushed Nickel Faucet | not specified | White | Gray RO | Brushed Nickel Faucet | White | White | Blue | not specified | White | White |
| Dimensions | 15 × 8 × 18 inches | 16 × 16 × 30 inches | 13 × 5.3 × 14.2 inches | 14.5 × 5.25 × 19 inches | 19 × 8 × 24 inches | 3.3 × 5.5 × 14.2 inches | 17.5 × 16 × 19 inches | 6.5 × 17.8 × 17.8 inches | 14.5 × 5.25 × 19 inches | 14.5 × 5.25 × 18.5 inches | 15.5 × 7 × 15.5 inches | 19.5 × 11 × 28 inches | 15 × 9 × 17 inches | 15 × 8 × 18 inches | 17 × 6 × 18 inches |
| Weight | 27.5 pounds | 32 pounds | not specified | 20 pounds | 21 pounds | 3.4 pounds | not specified | not specified | 20 pounds | 26.5 pounds | 16.2 pounds | 52 pounds | 12.3 pounds | 35 pounds | 29 pounds |
| Size | Regular | 20 Gallons | Standard | not specified | NSF 500 GPD RO | not specified | not specified | 800 GPD | not specified | 75 GPD with Faucet | 15.5"H x 15.5''L x 7" W | 300 GPD RO Tankless | not specified | not specified | Standard |
| Model | RCC7-BN | T20M | US31-NC | RCC7P-AK | RO500 | UVF20 | PH100 | RO800G | RCC7P | RCC7D | RCD100 | RCB3P | US31KF | RCC1UP | RCC7AK-UVF3 |
The iSpring Lineup at a Glance
Most models here are under-sink units, but they vary by capacity and design. The RCC7-BN offers compact 75 GPD filtration, while the RO800G delivers 800 GPD without a tank. If you need high flow, the RO500 provides 500 GPD with a 2:1 waste ratio. For low-pressure homes, the RCC7P and RCC7P-AK include booster pumps to maintain consistent output. These systems suit households prioritizing volume or pressure support. Other options like the PH100 add alkaline remineralization for taste and pH balance. If you rent or lack plumbing access, the RCD100 countertop unit provides instant hot water. The US31-NC and US31KF serve as simpler, three-stage filters for chlorine removal. For whole-house protection, the UVF20 LED system disinfects 12 GPM. Specialized needs are met by the RCC7D for deionization or the RCB3P for light commercial use. Each model targets specific spatial and performance requirements.
Where iSpring Fits Your Home
iSpring covers standard under-sink RO needs with compact 75 GPD units like the RCC7-BN and high-volume tankless systems like the 800 GPD RO800G. You also have countertop options for renters and whole-house UV disinfection for broader application. The range includes alkaline remineralization and deionization for technical use. However, none of these models offer smart app connectivity or remote monitoring. You must choose between traditional tank storage and space-saving tankless designs based on your cabinet width and water pressure requirements.
You can also view our list of the best travel system travel systems for your other needs.
How to choose the right one
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Check installation space
Measure the under-sink clearance before buying. The RCC7-BN fits in tight spots with an 8-inch width, while the RO800G requires a wider 17.8-inch footprint. Tankless models like the RO500 are taller at 24 inches, which may not fit under deep counters. Countertop units like the RCD100 need stable surface space. Ensure your cabinet has enough vertical and horizontal room for the unit and filter replacements.
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Match capacity to usage
Select a capacity that meets your daily water needs. The RCC7-BN produces 75 gallons per day, suitable for most standard households. Larger families or high-demand kitchens may need the 500 GPD RO500 or the 800 GPD RO800G. If you prefer a tank-based system, pair a standard unit with a 20-gallon tank like the T20M for consistent storage. Higher GPD ratings mean faster refill rates for drinking and cooking.
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Review filtration stages
More stages generally mean more thorough purification. The RCC7-BN uses five stages for standard contaminant removal. If you want alkaline remineralization, look at the 6-stage PH100 or RCC7P-AK. The RCC7AK-UVF3 adds a seventh stage for UV disinfection. Fewer stages, like the 3-stage US31-NC, offer faster flow but less comprehensive filtration. Choose the number of stages based on your water quality concerns and taste preferences.
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Verify certification needs
Certified systems provide verified contaminant removal. The RCC7-BN is NSF Certified, ensuring it meets specific safety standards. The tankless RO500 also holds NSF certification for reliable performance. If you need specialized purification for aquariums, the RCC7D includes deionization features. For general drinking water, look for clear certification labels. This ensures the system actually removes the pollutants you are concerned about, rather than just reducing them.
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Consider pure to drain
Water efficiency matters for long-term operation. The PH100 offers a 1:1 pure to drain ratio, which is highly efficient. The RO500 uses a 2:1 ratio, meaning it wastes more water during filtration. Standard tanked systems often have higher waste ratios. If you live in an area with water restrictions, prioritize models with lower waste ratios. This spec directly impacts your water bills and environmental footprint over the system's lifespan.
Frequently asked questions
Which iSpring RO system is best for small under-sink spaces?
The iSpring RCC7-BN is designed for compact installation. It measures 8 inches wide, 15 inches long, and 18 inches high. This 75 GPD unit fits standard under-sink cabinets while delivering NSF-certified five-stage filtration. It is ideal if you prioritize verified contaminant removal in tight spaces.
Does iSpring offer tankless reverse osmosis systems?
Yes, iSpring provides several tankless options to save space. The RO500 delivers 500 GPD with a 2:1 pure to drain ratio. The RCB3P offers 300 GPD for light commercial use, and the RO800G provides 800 GPD for high-demand households. These units produce water on demand without storage tanks.
Which iSpring model adds alkaline minerals to the water?
The iSpring PH100 is best for remineralization. It is a six-stage system that adds alkaline minerals for better taste and pH balance. The RCC7P-AK is another option, featuring a booster pump and alkaline filter. Both models are suitable for homes with low water pressure seeking improved water quality.
Can I use iSpring RO systems for aquariums or labs?
The iSpring RCC7D is designed for ultra-pure water needs. It includes deionization stages to remove ions, making it suitable for aquariums and laboratories. This 75 GPD system focuses on technical purity rather than daily drinking water enhancement. It is not recommended for general household consumption.
What is the best iSpring system for renters who cannot drill?
The iSpring RCD100 is a countertop system that requires no plumbing installation. It features five-stage filtration, UV protection, and instant hot water. Weighing 16.2 pounds, it is portable and fits on any counter. This model is ideal for renters who need clean drinking water without permanent modifications.
Does iSpring make whole-house water purification systems?
The iSpring UVF20 is a whole-house UV disinfection system. It handles up to 12 GPM and uses LED UV light to kill bacteria. It is not a reverse osmosis unit but complements existing filtration. This system is best for homes needing broad disinfection with a long service life.
Which iSpring RO system includes a booster pump?
Several models include booster pumps for low-pressure homes. The RCC7P and RCC7P-AK both feature pumps to ensure consistent flow. The RCB3P also includes a pump for its 300 GPD output. These systems help maintain performance when municipal water pressure is insufficient for standard RO operation.
What is the difference between iSpring sediment and RO filters?
The US31KF is a three-stage sediment and chlorine filter, not an RO system. It retains minerals and removes chlorine for fast flow. The US31-NC also offers chloramine removal. Unlike RO units, these do not remove dissolved solids. They are best for users who want mineral-rich water with simple installation.