5 Best APEC Water 6-Stage Reverse Osmosis Systems, Compared

Quick picks

The best fit for you

• You want the best overall certified alkaline system APEC Water ROES-PH75 75 GPD Alkaline It features WQA certification and a 75 GPD capacity for reliable mineral enhancement.
• You need higher flow rates for your family APEC Water RO-PH90 Brushed Nickel This 90 GPD model delivers more water per day than the standard 75 GPD options.
• You prioritize UV pathogen protection under the sink APEC ROES-UV75 75 GPD UV RO System It includes a UV filtration stage to neutralize pathogens while maintaining a 75 GPD output.
• You are a renter needing chilled water without installation APEC ROCT-C1 Countertop Chiller This countertop unit provides chilled, UV-purified water without requiring under-sink plumbing connections.

Our 5 picks

1 Best overall

APEC Water ROES-PH75 75 GPD Alkaline

Best for: WQA certified alkaline filtration

Filtration Stages

6-Stage (what this guide is about)

Capacity (GPD)

75 GPD

Design

Under sink

Certification

NSF 58, NSF 372, WQA

Filtration Type

Reverse osmosis, alkaline

Contaminants Removed

Chlorine, fluoride, arsenic, lead

View on Amazon: APEC Water ROES-PH75 75 GPD Alkaline Affiliate link

The APEC Water ROES-PH75 is a 6-stage under-sink reverse osmosis system with a 75 GPD capacity. It features a WQA certification and an alkaline filter stage that adds calcium minerals to improve pH and taste. This unit removes up to 99% of impurities, including lead and fluoride, from water with up to 2000 ppm TDS. It is designed for homeowners who want certified filtration and enhanced mineral content in their drinking water.

Pros

• WQA certified for quality assurance
• 6-stage filtration with alkaline enhancement
• 75 GPD production capacity
• Removes up to 99% of impurities
• Adds calcium minerals for better taste

Cons

• 75 GPD is slower than 90 GPD models
• Under-sink installation requires cabinet space
• No UV purification stage included

Good fit if

• You need WQA certified filtration
• You want alkaline-enhanced water
• You have under-sink cabinet space

Skip if

• You need faster than 75 GPD flow
• You want countertop placement
• You require UV sterilization

Verdict: APEC Water ROES-PH75 Alkaline RO System is the best overall choice for those prioritizing WQA certification and mineral enhancement. It suits households that value proven impurity removal and stable under-sink performance over higher flow rates or UV protection.

2 Also great

APEC Water RO-PH90 Brushed Nickel

Best for: higher flow alkaline water needs

Filtration Stages

6-Stage (what this guide is about)

Capacity (GPD)

90 GPD

Design

Under sink

Certification

NSF 372, NSF 58, WQA

Filtration Type

Reverse osmosis, alkaline

Contaminants Removed

Chlorine, VOCs, fluoride, arsenic, lead

View on Amazon: APEC Water RO-PH90 Brushed Nickel Affiliate link

The APEC RO-PH90 is a 6-stage under-sink reverse osmosis system with a 90 gallons per day capacity. It uses an alkaline filter stage to raise pH levels. The unit is WQA tested and certified to remove impurities like lead and arsenic. It includes a metal faucet and quick-connect fittings for installation. This model suits households needing higher output than standard 75 GPD units.

Pros

• 90 GPD output capacity
• 6-stage filtration with alkaline enhancement
• WQA tested and certified
• Includes metal faucet and quick-connect fittings

Cons

• Larger physical footprint than 75 GPD models
• No UV sterilization stage
• No built-in water storage tank mentioned

Good fit if

• You need a higher daily water output
• You prefer alkaline water for taste
• You want a certified under-sink system

Skip if

• You require UV light purification
• You have limited under-sink space
• You want a countertop unit

Verdict: APEC RO-PH90 90 GPD Alkaline RO System delivers higher flow and alkaline benefits for families needing more water than standard systems provide.

3 Best budget

APEC PH75 Alkaline 6-Stage RO

Best for: Budget-conscious buyers seeking certified alkaline water

Filtration Stages

6-Stage (what this guide is about)

Capacity (GPD)

75

Design

Under sink

Certification

WQA

Filtration Type

Reverse osmosis, alkaline

Installation Type

Under sink

View on Amazon: APEC PH75 Alkaline 6-Stage RO Affiliate link

This under-sink reverse osmosis unit delivers 75 gallons per day through six filtration stages. It includes an alkaline filter for remineralization, adding calcium to improve pH. The system holds WQA certification to reduce over 1,000 impurities. You get durable components designed for long-term use. It fits standard under-sink cabinets with a footprint of 15.5 by 5.25 inches. This model suits households seeking certified purity with enhanced mineral content.

Pros

• 75 GPD daily capacity
• WQA certified filtration
• Alkaline remineralization stage
• 6-stage reverse osmosis process

Cons

• 75 GPD output is lower than the 90 GPD RO-PH90 model
• No ultraviolet purification stage found in the ROES-UV75 model
• Fixed under-sink design lacks countertop portability

Good fit if

• You want WQA certified water purity
• You prefer alkaline remineralized water
• You need a standard under-sink installation

Skip if

• You require higher than 75 GPD flow rates
• You need ultraviolet germicidal treatment
• You prefer countertop placement options

Verdict: APEC Water Alkaline RO System 75 GPD offers solid certified performance for families needing reliable under-sink filtration with added minerals, though it lacks the higher capacity or UV protection of other APEC options.

4 Best uv filtration

APEC ROES-UV75 75 GPD UV RO System

Best for: UV pathogen protection under sink

Filtration Stages

6-Stage (what this guide is about)

Capacity (GPD)

75

Design

Under sink

Filtration Type

Reverse osmosis, UV

Contaminants Removed

Chlorine, fluoride, arsenic, lead

Installation Type

Under sink

View on Amazon: APEC ROES-UV75 75 GPD UV RO System Affiliate link

The APEC Water ROES-UV75 is a 6-stage under sink reverse osmosis system with 75 GPD capacity. It adds UV sterilization to destroy bacteria, viruses, and cysts. This model includes an alkaline stage for pH balance. It fits under most standard sinks. The system removes over 1,000 impurities. It suits households wanting extra pathogen protection without countertop space.

Pros

• UV sterilization destroys 99.99% of bacteria and cysts
• 6-stage filtration removes 99% of impurities
• Alkaline stage adds minerals and balances pH
• 75 GPD capacity for daily use
• 100% lead-free designer faucet included

Cons

• UV lamp requires power outlet under sink
• UV component adds to overall system weight
• No mention of smart monitoring or app connectivity

Good fit if

• You want UV protection against pathogens
• You have space under the sink
• You prefer alkaline mineral water

Skip if

• You need countertop installation
• You have no power under the sink
• You want a higher flow rate than 75 GPD

Verdict: APEC Water ROES-UV75 Under Sink RO System offers robust UV protection for families prioritizing pathogen safety. It delivers clean, alkaline water in a standard under-sink footprint.

5 Best premium

APEC ROCT-C1 Countertop Chiller

Best for: renters needing chilled water

Filtration Stages

6-Stage (what this guide is about)

Design

Countertop

Pure to Drain Ratio

3:1

Certification

NSF 372, NSF 58

Filtration Type

Reverse osmosis, UV

Installation Type

Countertop

View on Amazon: APEC ROCT-C1 Countertop Chiller Affiliate link

This countertop reverse osmosis system chills purified water to 40°F. It uses a 6-stage filtration process including UV purification. The unit features a 3:1 pure to drain ratio, which reduces waste during operation. You can monitor TDS levels via the front display. It requires no plumbing, making it suitable for renters or those without under-sink access.

Pros

• Chills water to 40°F with a built-in compressor
• 6-stage filtration includes UV purification
• 3:1 pure to drain ratio for efficiency
• No plumbing installation required

Cons

• Countertop design occupies significant counter space
• Requires a dedicated electrical outlet
• Limited to 27oz cold water reservoir capacity

Good fit if

• You need chilled water without plumbing
• You rent and cannot modify pipes
• You want UV purification added to RO

Skip if

• You have limited counter space
• You need high-volume storage
• You prefer under-sink installation

Verdict: APEC Water Countertop RO Chiller delivers chilled, UV-purified water without installation. It fits renters or those with limited space under the sink who prioritize cold water access.

Specifications side by side

Key specs to compare for APEC

1. Check alkaline filtration presence

   Several models in this list include an alkaline filter to adjust pH levels. The ROES-PH75 and RO-PH90 both feature this stage. You should verify if the system adds minerals back into the water. This feature suits buyers who prefer slightly alkaline drinking water. The PH75-ROES also lists remineralization. Check the attributes section for this specific feature. It is not present in every model. Ensure you select a unit with this filter if mineral enhancement is a priority for your household.

2. Compare daily water capacity

   Capacity determines how much purified water the system produces daily. Most models offer 75 gallons per day. The RO-PH90 stands out with 90 GPD. Higher capacity helps larger families or those who use more water. You should match this spec to your daily usage habits. If you need more water for cooking or filling containers, the 90 GPD model is better. Standard 75 GPD units are sufficient for average households. Review the capacity attribute for each product before deciding.

3. Evaluate UV protection needs

   Some systems include UV filtration for additional pathogen protection. The ROES-UV75 model features this technology. It provides an extra layer of safety against bacteria. This is useful if you are concerned about water quality beyond standard filtration. Not all models have UV protection. The ROCT-C1 also includes UV purification. You should choose this feature if you want enhanced safety. Check the attributes list for UV filtration. It is a specific upgrade available in select models within this guide.

4. Choose between installation types

   You must decide between under-sink and countertop installations. Most models are designed for under-sink mounting. The ROCT-C1 is a countertop chiller. Countertop units suit renters or those with limited cabinet space. Under-sink models like the ROES-PH75 save counter space. Consider your kitchen layout and rental agreement. If you cannot drill holes, choose the countertop option. If you have space under the sink, the under-sink models offer more capacity. Verify the installation type attribute for each product.

5. Assess physical dimensions

   Physical size determines if the unit fits your space. Under-sink models vary in width and height. The ROES-PH75 is 5.25 inches wide. The RO-PH90 is wider at 7 inches. You must measure your cabinet before purchasing. The ROCT-C1 has different dimensions as a countertop unit. Check the specs section for width, height, and length. Ensure there is enough clearance for maintenance. Larger units like the RO-PH90 weigh more. Verify these measurements against your available space to avoid installation issues.

Frequently asked questions

See also

• best APEC Water reverse osmosis systems under 300
• best APEC Water reverse osmosis systems with alkaline filter
• best APEC Water 6-Stage reverse osmosis systems
• system stages explained