Best Aquasana Reverse Osmosis Systems: 5 Models Compared

Quick picks

Our 5 picks

1 Best overall

Aquasana AQ-6300-BN 3-Stage Under Sink

Best for: fast under-sink contaminant reduction

Filtration Stages

3-Stage

Design

Under sink

Certification

WQA, NSF 42, 53 & 401

Contaminants Removed

Lead, PFAS, microplastics, chloramines

Installation Type

Under sink

Features

Chlorine Reduction

View on Amazon: Aquasana AQ-6300-BN 3-Stage Under Sink Affiliate link

This Aquasana under sink unit uses Claryum 3-stage filtration to reduce 78 contaminants, including lead and PFAS, while retaining minerals. It is WQA certified to NSF 42, 53, and 401 standards. The system delivers 0.5 gallons per minute, which is five times faster than pitcher filters. It fits under most sinks with 12 inches of space. You get a brushed nickel faucet and a one-year limited warranty with DIY installation.

Pros

• Reduces 78 contaminants including lead, PFAS, and microplastics
• WQA certified to NSF 42, 53, and 401
• Fast flow rate of 0.5 gallons per minute
• Retains beneficial minerals in filtered water

Cons

• Does not reduce Total Dissolved Solids (TDS)
• Requires 12 inches of clearance under the sink
• Limited to one-year warranty coverage

Good fit if

• You want fast flow without waiting for pitchers
• You need certified removal of lead and PFAS
• You prefer DIY installation with included parts

Skip if

• You require reverse osmosis TDS reduction
• You have less than 12 inches of under-sink space
• You need a smart or connected filtration system

Verdict: Aquasana 3-Stage Under Sink Filter offers certified contaminant reduction and fast flow for standard under-sink setups. It fits buyers who prioritize speed and mineral retention over TDS removal.

2 Best budget

Aquasana Claryum Direct Connect Under Sink

Best for: mineral-retention under sink filtration

Design

Under sink

Certification

WQA

Contaminants Removed

Lead, PFAS, mercury, asbestos

Installation Type

Under sink

Features

Chlorine Reduction

Dimensions

4 × 4 × 20.5 inches

View on Amazon: Aquasana Claryum Direct Connect Under Sink Affiliate link

The Aquasana AQ-MF-1 is an under-sink carbon filtration system designed for direct connection to your cold water line. It removes up to 99% of 78 contaminants, including lead, PFAS, and mercury, while retaining healthy minerals like calcium and magnesium. The unit measures 4 by 4 by 20.5 inches and weighs 5 pounds. It requires a 3-inch clearance for filter changes and does not reduce total dissolved solids.

Pros

• Removes up to 99% of 78 contaminants including lead and PFAS
• Retains beneficial minerals like calcium and magnesium
• No dedicated faucet or countertop drilling required
• Compact 4 x 4 x 20.5 inch design

Cons

• Does not reduce total dissolved solids
• Requires 3-inch clearance for filter changes
• Not suitable for hard water without a pre-filter

Good fit if

• You want to retain natural minerals in your water
• You prefer not to drill a hole for a dedicated faucet
• You have limited under-sink clearance

Skip if

• You need a system that reduces TDS
• You have hard water and no pre-filter
• You want a countertop unit

Verdict: Aquasana AQ-MF-1 Under Sink Carbon Filter is a practical choice for renters or homeowners who want to remove contaminants without altering their faucet setup. It suits those who value mineral retention over TDS reduction.

3 Also great

Aquasana SmartFlow Brushed Nickel RO

Best for: Certified contaminant reduction and remineralization

Design

Under sink

Certification

WQA, NSF/ANSI 42, 53, 58, 401

Filtration Type

Reverse osmosis, remineralization

Contaminants Removed

PFAS, lead, fluoride, microplastics

Installation Type

Under sink

Color

Brushed Nickel

View on Amazon: Aquasana SmartFlow Brushed Nickel RO Affiliate link

This under sink reverse osmosis system reduces up to 99.99% of 90 contaminants, including lead, PFAS, and fluoride. It features patented SmartFlow technology for higher efficiency and less water waste. A built-in remineralizer adds calcium and magnesium back into the water. The unit measures 15 inches long and 4.5 inches wide, fitting standard under-counter spaces. It includes a brushed nickel faucet and a 2-year limited warranty.

Pros

• WQA Certified to reduce 99.99% of 90 contaminants
• Patented SmartFlow technology improves efficiency and reduces waste
• Remineralizer stage restores calcium and magnesium
• Compact under sink design fits most cabinets

Cons

• Only includes a 2-year limited warranty
• Professional installation is recommended
• No app or remote connectivity listed

Good fit if

• You want certified reduction of 90 specific contaminants
• You prefer water with remineralized minerals for better taste
• You need a compact under sink unit

Skip if

• You require a longer warranty than 2 years
• You want a countertop or faucet-mounted unit
• You need smart home integration or app control

Verdict: Aquasana SmartFlow Under Sink RO is a solid choice for households prioritizing certified contaminant reduction and remineralization in a compact footprint. It suits those who value efficiency and taste over smart features or extended warranty coverage.

4 Best premium

Aquasana Countertop RO Filter

Best for: renters wanting mineral retention

Design

Countertop

Contaminants Removed

Lead, PFAS, microplastics, mercury

Installation Type

Countertop

Dimensions

9.69 × 7.96 × 11.6 inches

Weight

6.2 pounds

View on Amazon: Aquasana Countertop RO Filter Affiliate link

This Aquasana countertop unit uses Claryum technology to reduce up to 99% of 78 contaminants, including lead, PFAS, and microplastics. It retains healthy minerals like calcium and magnesium without lowering TDS. The system delivers an 8-ounce glass in 8 seconds. You do not need plumbing or tools. The filter lasts for 300 gallons or 6 months. It fits well on your counter.

Pros

• Reduces up to 99% of 78 contaminants
• Retains natural minerals like calcium and magnesium
• Delivers filtered water in 8 seconds
• No installation or plumbing required

Cons

• Countertop design takes up counter space
• Does not reduce total dissolved solids
• Filter replacement needed every 300 gallons

Good fit if

• You rent and cannot modify plumbing
• You want to retain healthy minerals
• You need quick filtration without tools

Skip if

• You need under-sink installation
• You want to reduce TDS
• You have limited counter space

Verdict: Aquasana Countertop Water Filter suits renters who want contaminant reduction without plumbing changes. It retains minerals and filters quickly, but it occupies counter space and does not lower TDS.

5 Also great

Aquasana Countertop Water Filter AQ-CWM2-B

Best for: renters avoiding permanent plumbing changes

Design

Countertop

Contaminants Removed

Lead, PFAS, microplastics, mercury

Installation Type

Countertop

Dimensions

9.69 × 7.96 × 11.6 inches

Weight

6.2 pounds

View on Amazon: Aquasana Countertop Water Filter AQ-CWM2-B Affiliate link

This Aquasana countertop filter uses Claryum technology to reduce up to 99% of 78 contaminants, including lead, PFAS, and microplastics. It delivers an eight-ounce glass of water in eight seconds. The unit retains healthy minerals like calcium and potassium, meaning it does not reduce total dissolved solids. You get a compact system measuring 9.69 by 7.96 by 11.6 inches. It requires no plumbing or installation, making it a straightforward option for renters or those avoiding permanent modifications.

Pros

• Reduces up to 99% of 78 contaminants
• Produces filtered water in eight seconds
• Retains beneficial minerals like calcium and potassium
• Requires no plumbing or installation

Cons

• Does not reduce total dissolved solids
• Requires filter replacement every 300 gallons
• Limited to countertop placement only

Good fit if

• You want to reduce lead and PFAS without plumbing work
• You prefer water with retained minerals
• You need a portable filtration solution

Skip if

• You need a system that reduces total dissolved solids
• You want an under-sink installation
• You require high-volume filtered water output

Verdict: Aquasana Countertop Water Filter suits you if you need a plug-and-play solution for removing specific contaminants while keeping minerals in your water. It is ideal for small kitchens where permanent installation is not an option.

Specifications side by side

Aquasana RO Systems at a Glance

Aquasana offers distinct options based on installation type. The AQ-6300-BN 3-Stage Under Sink and SmartFlow Brushed Nickel RO fit under counters for permanent setups. These units provide certified contaminant reduction. The Claryum Direct Connect system also serves under-sink needs with a compact footprint. These models suit homeowners seeking reliable filtration without altering existing faucet configurations.

Countertop models like the AQ-CWM2-B serve renters who avoid permanent plumbing changes. These units sit on the counter and retain minerals while filtering water. They occupy space but require no installation. You choose under-sink models for speed and capacity. You select countertop versions for flexibility. Each option addresses specific kitchen constraints and filtration priorities.

Where Aquasana Fits Your Needs

Aquasana covers three main installation types. You can choose compact under-sink models like the AQ-6300-BN or the SmartFlow RO. These fit behind cabinets and offer certified contaminant reduction. The Claryum Direct Connect system also mounts under the sink for renters who want mineral retention. Countertop options like the AQ-CWM2-B sit on your counter. They require no plumbing changes and keep minerals in your water. None of these units lower total dissolved solids. You also get brushed nickel finishes across several models. If you need whole-house filtration or smart app connectivity, this brand does not offer those features in its current lineup.

How to Choose the Right Aquasana RO System

1. Check Installation Type

   Decide between under-sink and countertop units first. Under-sink models like the AQ-6300-BN fit behind cabinets and require permanent plumbing. Countertop filters like the AQ-CWM2-B sit on your counter and need no installation. This choice depends on your rental status and kitchen layout. Permanent setups offer better space efficiency. Countertop units provide flexibility for renters who cannot modify plumbing. Verify your available space before selecting a model.

2. Review Filtration Stages

   Look at the number of filtration stages. The AQ-6300-BN uses a 3-Stage design for fast contaminant reduction. The Claryum Direct Connect system offers a complete filter approach. More stages often mean broader contaminant removal. However, Aquasana systems focus on mineral retention. This keeps beneficial minerals in your water. Check if you need high-speed flow or specific contaminant targeting. The stage count helps you match the system to your water quality needs.

3. Measure Physical Dimensions

   Compare the width, height, and length of each unit. The AQ-6300-BN measures 12 inches long and 9 inches high. The SmartFlow RO is slightly taller at 12.9 inches. Countertop models like the AQ-CWM2-B are wider at nearly 8 inches. Ensure your under-sink cabinet has enough clearance. Measure the space carefully before purchasing. A unit that is too large will not fit. Proper dimensions ensure a clean installation without blocking other pipes.

4. Consider Mineral Retention

   Aquasana systems are known for retaining minerals. The AQ-6300-BN and Claryum Direct Connect both preserve beneficial minerals. This is different from standard RO systems that remove all TDS. If you prefer mineral-rich water, choose these models. The countertop AQ-CWM2-B also retains minerals. This feature improves taste and health benefits. Check the product description to confirm mineral retention. This spec is key for buyers who dislike flat-tasting water.

5. Assess Weight and Portability

   Check the weight if you move often. The Claryum Direct Connect weighs 5 pounds. The countertop AQ-CWM2-B weighs 6.2 pounds. Under-sink units are heavier due to tank components. Lighter units are easier to relocate for renters. Heavier units stay fixed in place. Consider how often you move. If you stay in one home, weight matters less. For frequent movers, lighter countertop options are more practical. Portability is a key factor for temporary living situations.

Frequently asked questions

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