Max Water 100 GPD Reverse Osmosis Alternatives: 6 Similar Picks Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
The Max Water 100 GPD 5-Stage RO System delivers high-volume filtration with NSF certified components. If you are searching for max water 100 gpd reverse osmosis alternatives, you may want different specs or a different brand. This system suits households with city water pressure. It prioritizes output volume over water efficiency. The pure to drain ratio is 1:2. This means it sends more water to the drain than you collect.
Some buyers prefer tankless designs or better water conservation. Others need a smaller footprint or a different filtration stage count. The alternatives listed here were chosen because their specs overlap with the original product. They share the under-sink installation type and similar capacity ranges. Each pick offers a distinct advantage. You might want a 600 GPD unit for faster flow. You might prefer a 50 GPD system for smaller spaces. This guide compares 6 similar picks to help you find the right fit.
How each alternative compares
APEC ROES-50 5-Stage Under Sink RO
The APEC ROES-50 cuts capacity in half, offering 50 GPD instead of 100 GPD. This makes it better for small households with low daily water needs. It keeps the 5-stage filtration but lacks the NSF certification found in the Max Water unit. You get a simpler, budget-friendly system without the certified tank or faucet. It is slightly taller and heavier, which matters for tight under-sink spaces. Choose this if you do not need high volume and want a basic, reliable setup without premium features.
iSpring RO100 100 GPD Under Sink
The iSpring RO100 matches the 100 GPD output but improves efficiency with a 1:1 pure-to-drain ratio, compared to the Max Water’s 1:2 ratio. It features clear housing for easy maintenance visibility, which the opaque Max Water tank lacks. However, it does not include a storage tank in this configuration, requiring you to manage flow differently. It is larger and heavier, taking up more cabinet space. Pick this if you prioritize water efficiency and filter monitoring over included storage hardware.
Waterdrop G2P600 Tankless RO System
The Waterdrop G2P600 offers significantly higher capacity at 600 GPD, making it ideal for large families needing rapid water production. It uses a tankless design, saving under-sink space compared to the Max Water’s bulky tank. The waste ratio is 2:1, which is less efficient than the Max Water’s 1:2 ratio. It includes NSF certification and a modern, compact form factor. Choose this if you need fast flow rates and want to eliminate tank storage, accepting higher water waste for speed.
NU Aqua 5-Stage Under Sink RO System
The NU Aqua 100 GPD system matches the original capacity and filtration stages but includes a bonus testing meter for monitoring water quality. It lacks the explicit NSF certification listed for the Max Water unit. The system is slightly taller and lighter, which may fit narrower cabinets better. It is a solid choice if you value included diagnostic tools and comparable output. You trade certified components for the added utility of a testing meter and potentially easier installation in tight spaces.
VIVA21 5-Stage Under Sink RO
The VIVA21 5-Stage system focuses on certified filtration with NSF/ANSI 58 compliance for the RO membrane, matching the Max Water’s safety standards. It bundles leak protection, a feature not specified for the Max Water unit. This system lacks stated capacity metrics, so you cannot confirm if it matches the 100 GPD output. It is wider and deeper, requiring more cabinet width. Select this if certified membrane performance and leak safety are your top priorities over known high-volume output.
iSpring RCC100P 100 GPD Under Sink RO System
The iSpring RCC100P provides 100 GPD output with a design suited for low water pressure environments, unlike the Max Water which recommends a booster pump for well water. It is significantly heavier and wider, requiring a spacious cabinet. The unit includes a dedicated tank and faucet setup. Choose this if you have low incoming pressure and need a robust, high-capacity system with proven performance in challenging water conditions. It is a bulkier option that prioritizes pressure reliability over compact size.
Quick picks
Our 7 picks
Max Water 100 GPD 5-Stage RO System
Best for: High volume households with city water
- Filtration Stages
- 5
- Capacity (GPD)
- 100 GPD
- Pure to Drain Ratio
- 1:2
- Contaminants Removed
- TDS
- Installation Type
- Under sink, countertop, wall mount
- Micron Rating
- 0.0001 micron
View on Amazon: Max Water 100 GPD 5-Stage RO System Affiliate link
This Max Water reverse osmosis unit delivers 100 gallons per day through a five-stage filtration process. It reduces contaminants down to 0.0001 micron and removes 95–98% of total dissolved solids. The system includes an NSF certified tank and faucet. It fits under sinks or on countertops. You get fresh water for cooking and drinking without taking up counter space.
Pros
- High 100 GPD daily capacity
- NSF certified tank and faucet
- 0.0001 micron filtration rating
- Fits under sink or countertop
- Removes 95–98% of TDS
Cons
- 1:2 pure to drain waste ratio
- Booster pump needed for well water
- No smart monitoring or app
Good fit if
- You need high daily output
- You have standard city water pressure
- You want certified components
Skip if
- You rely on well water
- You want zero wastewater
- You need smart connectivity
Verdict: Max Water 100 GPD 5-Stage RO System offers strong capacity and certified parts for homes needing high volume. It suits those with city water pressure who prioritize output over water efficiency.
APEC ROES-50 5-Stage Under Sink RO
Best for: small households needing basic filtration
- Filtration Stages
- 5
- Capacity (GPD)
- 50 GPD
- Design
- Under sink
- Certification
- NSF/ANSI 372, NSF/ANSI 58
- Filtration Type
- Reverse osmosis
- Contaminants Removed
- Arsenic, chlorine, lead, fluoride, PFAS
View on Amazon: APEC ROES-50 5-Stage Under Sink RO Affiliate link
This APEC Water ROES-50 system provides 50 GPD of filtered water through five filtration stages. It is designed for under-sink installation and includes a brushed nickel faucet and storage tank. The unit removes up to 99.99% of impurities, including lead and chlorine. Its compact dimensions fit standard cabinetry. You should choose this if you need reliable basic filtration without high daily output.
Pros
- 5-stage filtration removes 99.99% of impurities
- Includes brushed nickel faucet and storage tank
- Quick connection fittings for easy DIY setup
- Compact size fits under sink cabinets
Cons
- 50 GPD capacity is lower than 100 GPD alternatives
- No smart monitoring or app control
- Standard tank storage limits immediate flow rate
Good fit if
- You have low daily water usage needs
- You want a complete kit with faucet included
- You prefer simple mechanical filtration stages
Skip if
- You require high flow rates for large families
- You need instant unfiltered water access
- You want smart home integration features
Verdict: APEC Water 5-Stage Under Sink RO is a solid choice for small households needing reliable, basic filtration. It suits buyers who prioritize simplicity and included hardware over high capacity or smart features.
iSpring RO100 100 GPD Under Sink
Best for: High daily water needs with easy maintenance
- Filtration Stages
- 5
- Capacity (GPD)
- 100
- Pure to Drain Ratio
- 1:1
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
- Capacity
- 100 GPD
View on Amazon: iSpring RO100 100 GPD Under Sink Affiliate link
The iSpring RO100 is a 5-stage under sink reverse osmosis system rated at 100 gallons per day. It features a 1:1 pure to waste water ratio and includes a clear first-stage housing for easy filter inspection. The unit uses a Dupont membrane and US-made filters to remove contaminants. It fits under standard sinks and includes a brushed nickel faucet. This system suits households needing high daily output with straightforward maintenance.
Pros
- 100 GPD capacity for fast water production
- 1:1 pure to waste water ratio
- Clear first-stage housing for visual inspection
- Includes quick-fit connectors for easy installation
Cons
- No built-in storage tank listed in specifications
- Requires additional tubing for ice maker connection
- 1-year manufacturer warranty is shorter than some competitors
Good fit if
- You need a high-flow system for a large family
- You prefer visual checks on filter condition
- You want a US-made filter setup
Skip if
- You require a built-in storage tank
- You need ice maker integration without extra parts
- You want a longer warranty period
Verdict: The iSpring RO100 100 GPD Under Sink RO delivers efficient water production with a 1:1 waste ratio and clear housing for maintenance. It is a solid choice for users prioritizing flow rate and filter visibility over built-in storage.
Waterdrop G2P600 Tankless RO System
Best for: High-volume households needing tankless efficiency
- Filtration Stages
- 7
- Capacity (GPD)
- 600
- Design
- Tankless
- Pure to Drain Ratio
- 2:1
- Certification
- NSF/ANSI 372
- Filtration Type
- Reverse osmosis
View on Amazon: Waterdrop G2P600 Tankless RO System Affiliate link
The Waterdrop G2P600 is a tankless, under-sink reverse osmosis system with a 600 GPD capacity. It features seven filtration stages and holds NSF/ANSI 372 certification for lead-free materials. The unit operates with a 2:1 pure-to-drain ratio, which conserves water during use. Its dimensions are 17.3 by 5.8 by 14 inches. This model suits households needing high daily output without a storage tank.
Pros
- 600 GPD production capacity
- Tankless design saves space
- NSF/ANSI 372 certified for lead-free materials
- 2:1 pure-to-drain ratio
Cons
- Professionally refurbished condition
- Heavier build at 25.4 pounds
- No storage tank for backup supply
Good fit if
- You need high daily water output
- You prefer tankless under-sink designs
- You want NSF certified materials
Skip if
- You require a new, unopened unit
- You need a system with a storage tank
- You have limited under-sink weight capacity
Verdict: Waterdrop G2P600 600 GPD Tankless RO delivers fast flow and efficient water use for families needing high volume. It fits users prioritizing tankless efficiency and certified materials over new-unit condition.
NU Aqua 5-Stage Under Sink RO System
Best for: High flow needs with bonus meter
- Filtration Stages
- 5
- Capacity (GPD)
- 100
- Design
- Under sink
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
- Capacity
- 100 GPD
View on Amazon: NU Aqua 5-Stage Under Sink RO System Affiliate link
The NU Aqua 100 GPD system delivers high flow under your sink. It uses a 5-stage reverse osmosis process with a HydraCoil membrane. The unit includes a bonus PPM meter for testing. You get a 3-year warranty and a 120-day trial. It fits standard under-sink spaces. This model suits households needing faster water output.
Pros
- 100 GPD high flow rate
- HydraCoil membrane for cleaner water
- Includes bonus PPM meter
- 3-year manufacturer warranty
Cons
- Heavier at 20 pounds
- Larger footprint than 50 GPD models
- No app or smart connectivity
Good fit if
- You need fast water flow
- You want a PPM meter included
- You prefer a 3-year warranty
Skip if
- You have very limited under-sink space
- You want smart home integration
- You prefer a lighter system
Verdict: NU Aqua 100 GPD Under Sink RO offers high output and a bonus testing meter. It fits buyers who prioritize flow rate and warranty length over compact size.
VIVA21 5-Stage Under Sink RO
Best for: Certified filtration with bundled leak protection
- Filtration Stages
- 5
- Design
- Under sink
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
- Certification
- NSF Certified
- Dimensions
- 19 × 18 × 16 inches
View on Amazon: VIVA21 5-Stage Under Sink RO Affiliate link
This under-sink system provides five-stage reverse osmosis filtration using sediment, carbon, membrane, and post-carbon stages. It holds WQA Gold Seal certification to NSF/ANSI 58 and NSF/ANSI/CAN 372 standards for material safety and performance. The kit includes a dedicated faucet, storage tank, and leak detector. It suits you if you want verified contaminant reduction with bundled leak protection.
Pros
- WQA Gold Seal certified to NSF/ANSI 58 and NSF/ANSI/CAN 372
- Includes a dedicated faucet, storage tank, and leak detector
- Five-stage filtration with sediment, carbon, and RO membrane
- Lifetime limited parts support alongside a 1-year warranty
Cons
- Published specifications do not list a daily gallon production rating
- Base 5-stage configuration does not include remineralization
- Requires cabinet space for a 19 by 18 by 16 inch unit plus tank
Good fit if
- You want independent WQA Gold Seal certification for NSF/ANSI 58 standards.
- You want an all-in-one kit that includes a leak detector.
Skip if
- You require a specified gallon-per-day output rating upfront.
- You have tight under-sink clearance that cannot fit the unit and tank.
Verdict: VIVA21 5-Stage Under Sink Reverse Osmosis System fits households seeking certified NSF/ANSI 58 water filtration with bundled leak protection.
iSpring RCC100P 100 GPD Under Sink RO System
Best for: High-volume households with low water pressure
- Filtration Stages
- 5
- Capacity (GPD)
- 100
- Design
- Under sink
- Filtration Type
- Reverse osmosis
- Installation Type
- Under sink
- Capacity
- 100 GPD
View on Amazon: iSpring RCC100P 100 GPD Under Sink RO System Affiliate link
The iSpring RCC100P is a 5-stage reverse osmosis system designed for under-sink installation. It produces 100 gallons per day, meeting higher daily water needs than standard 50 GPD units. An electric booster pump ensures consistent flow regardless of inlet pressure. The transparent first-stage housing allows for easy visual inspection of pre-filters. This system targets households seeking high-capacity, reliable drinking water filtration.
Pros
- 100 GPD production capacity for high-demand households
- Electric booster pump maintains consistent water pressure
- Transparent first-stage housing for easy filter inspection
- 5-stage filtration reduces over 1,000 contaminants
Cons
- Larger footprint requires 19 by 14.5 by 8 inches of space
- Heavier at 33.5 pounds, requiring sturdy cabinet support
- No mention of a smart display or water quality sensor
Good fit if
- You need a high daily output of purified water
- You have low incoming water pressure
- You want to visually check pre-filter status
Skip if
- You have limited under-sink storage space
- You prefer a compact, lightweight unit
- You want a system with digital monitoring
Verdict: iSpring RCC100P 100 GPD Under Sink RO is ideal for families needing high-volume clean water with reliable pressure. It fits well in spacious cabinets where its larger size and weight are manageable.
Specifications side by side
| Spec | Max Water 100 GPD 5-Stage RO System | APEC ROES-50 5-Stage Under Sink RO | iSpring RO100 100 GPD Under Sink | Waterdrop G2P600 Tankless RO System | NU Aqua 5-Stage Under Sink RO System | VIVA21 5-Stage Under Sink RO | iSpring RCC100P 100 GPD Under Sink RO System |
|---|---|---|---|---|---|---|---|
| Filtration Stages | 5 | 5 | 5 | 7 | 5 | 5 | 5 |
| Capacity (GPD) | 100 GPD | 50 GPD | 100 | 600 | 100 | not stated | 100 |
| Design | not stated | Under sink | not stated | Tankless | Under sink | Under sink | Under sink |
| Pure to Drain Ratio | 1:2 | not stated | 1:1 | 2:1 | not stated | not stated | not stated |
| Certification | not stated | NSF/ANSI 372, NSF/ANSI 58 | not stated | NSF/ANSI 372 | not stated | not stated | not stated |
| Filtration Type | not stated | Reverse osmosis | Reverse osmosis | Reverse osmosis | Reverse osmosis | Reverse osmosis | Reverse osmosis |
| Contaminants Removed | TDS | Arsenic, chlorine, lead, fluoride, PFAS | not stated | not stated | not stated | not stated | not stated |
| Installation Type | Under sink, countertop, wall mount | Under sink | Under sink | Under sink | Under sink | Under sink | Under sink |
| Micron Rating | 0.0001 micron | not stated | not stated | not stated | not stated | not stated | not stated |
| Capacity | 100 GPD | 50 GPD | 100 GPD | 600 GPD | 100 GPD | not stated | 100 GPD |
| Use | not stated | Drinking Water | Drinking Water | not stated | Drinking Water, Home, Kitchen | not stated | Drinking Water |
| Color | White | White | White | White | White | not stated | White |
| Dimensions | 15 × 5.25 × 16 inches | 15.5 × 5.25 × 17 inches | 19 × 17.5 × 16 inches | 17.3 × 5.8 × 14 inches | 15 × 5.5 × 17.5 inches | 19 × 18 × 16 inches | 8 × 19 × 14.5 inches |
| Weight | not stated | 24.9 pounds | 28.2 pounds | 25.4 pounds | 20 pounds | not stated | 33.5 pounds |
| Model | RO-5W2 | ROES-50 | RO100 | WD-G2P600-W | WU-100GPD-NP | V21RS5S01 | RCC1P |
| Size | not stated | RO System | not stated | 600 GPD | RO - Stage 5 | not stated | 100 GPD |
If you are comparing handheld computer hardware specifications instead of water treatment, review weeliao gpd win max 2 alternatives.
Frequently asked questions
Which alternative offers the highest daily water capacity?
The Waterdrop G2P600 provides the highest capacity at 600 GPD. This tankless system delivers fast flow without a storage tank. It maintains a 2:1 pure to drain ratio. This makes it ideal for high-volume households needing efficiency and speed.
Is there a reverse osmosis system with a better waste water ratio?
Yes, the iSpring RO100 features a 1:1 waste ratio. This means it produces equal amounts of pure and waste water. It also uses clear housing for easy maintenance. This ratio is more efficient than the standard 3:1 or 4:1 ratios found in many systems.
Which system is best for small households with low water needs?
The APEC ROES-50 is best for small households. It offers 50 GPD capacity, which suits low daily water needs. It provides reliable basic filtration with 5 stages. This model prioritizes simplicity and included hardware over high output or smart features.
Do any alternatives include certified filtration components?
Several options include certified parts. The Max Water 100 GPD and Waterdrop G2P600 are NSF Certified. The VIVA21 system features NSF/ANSI 58 certification. These certifications ensure the materials and filtration performance meet specific safety and quality standards for drinking water.
Which tankless option is suitable for families needing high volume?
The Waterdrop G2P600 is the top tankless choice. It delivers 600 GPD without a storage tank. This design ensures fresh water on demand. It fits users who prioritize tankless efficiency and certified materials over traditional storage-based systems.
Which system includes a bonus testing meter?
The NU Aqua 5-Stage Under Sink RO System includes a bonus testing meter. It offers 100 GPD capacity for high flow needs. This addition helps you monitor water quality easily. It is a practical choice for buyers who value flow rate and included accessories.
Which alternative includes bundled leak protection?
The VIVA21 5-Stage Under Sink RO includes bundled leak protection. It provides certified NSF/ANSI 58 filtration. This safety feature helps prevent water damage under the sink. It is a solid choice for households seeking added protection with their filtration system.
Which system is best for low water pressure environments?
The iSpring RCC100P is ideal for low water pressure. It delivers 100 GPD with reliable pressure output. This system suits families needing high-volume clean water. It requires a spacious cabinet due to its larger size and 33.5-pound weight.