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Comparison Ro System Pure To Drain Water Ratio Comparison - May 2026
| 1 Best Choice  9.8Exceptional | 2 Best Value  9.5Excellent | 3  9.3Excellent | 4  9.1Excellent |
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ModeliSpring RCB3P Tankless Reverse Osmosis Filtration System, 300 GPD Under Sink RO System, Reduces TDS, 1.5:1 Pure to Drain, Booster Pump & Pressure Gauge for Residential & Light Commercial Use | Model Brio Reverse Osmosis Water Filtration System, 700 GPD, 2:1 Pure to Drain, Tank-Less, Under Sink Faucet Mount | Model Brio Reverse Osmosis Water Filtration System, 500 GPD, 2:1 Pure to Drain, Tank-Less, Under Sink Faucet Mount | Model COMFEE' Reverse Osmosis System, 400 GPD, 1.5:1 Pure to Drain, Tankless RO System, NSF Standards, TDS Reduction, USA Tech Support, Under Sink Water Filter System with Brushed Nickel Faucet |
BrandiSpring | Brand Brio | Brand Brio | Brand COMFEE' |
Reviews | Reviews  | Reviews | Reviews |
Tech Specs | |||
product dimensions 19.5L x 11W x 28H | product dimensions 18.2 x 5.2 x 16.5 inches 31.4 Pounds | product dimensions 18 x 6 x 17 inches 30.7 Pounds | product dimensions 16 x 7 x 15 inches 22 Pounds |
Review | Review - | Review - | Review |
Available On | Available On  | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.8
1iSpringiSpring RCB3P Tankless Reverse Osmosis Filtration System, 300 GPD Under Sink RO System, Reduces TDS, 1.5:1 Pure to Drain, Booster Pump & Pressure Gauge for Residential & Light Commercial Use
Why we love it
Removes 99% of contaminants.
Great for commercial use.
Reliable and low maintenance.
Main highlights- Under Sink RO Water Filtration System - This high-capacity reverse osmosis system removes up to 99% of over 1, 000 contaminants and hardness, including PFAS (PFOA and PFOS), lead, chlorine, fluoride, arsenic, asbestos, calcium, sodium and more
- Residential & Light Commercial Use - The iSpring RCB3P tankless reverse osmosis system is perfect for light commercial use, delivering high-quality RO water to restaurants, salons, labs, and offices—each benefiting in their own unique way.
- High Production Rate RO Water Filter - Super-efficient RO membranes deliver up to 300 gallons of purified reverse osmosis water per day, removing a wide range of contaminants as small as 0.0001 microns.
- Durable RO System & Easy Installation - Freestanding stainless steel frame and metal hanging bracket. Makes your installation and filter changes easier while adding a protective buffer for your system.
- 1.5:1 Pure to Drain Under Sink Tankless RO System - The built-in booster pump increases purified water production by raising water pressure. Compatible with 11- or 20-gallon iSpring storage tanks. TANK NOT INCLUDED
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9.5
2Brio14% Off
Brio Reverse Osmosis Water Filtration System, 700 GPD, 2:1 Pure to Drain, Tank-Less, Under Sink Faucet Mount
Main highlights- WHAT’S INCLUDED: RO under sink filtration system, dual-levered smart faucet, PCB filter, RO filter, installation kit, user manual
- SPACE-SAVING DESIGN: Sleek and modern, the Brio G20-U RO system measures 5.2” W x 16.5” H x 18.2” D and takes up approximately 30% of typical under sink space, preserving 70% for storage. The innovative tankless filtration design has an integrated system that’s leak-proof and resists recontamination, a hazard for a reverse osmosis under sink system with a tank
- SMART FAUCET WITH 2 FILTRATION OPTIONS: The LED smart faucet features a TDS meter, so you know what the TDS level is in your RO-purified water, and a filter life reminder that shows the percentage of filter life left, so you know exactly when filters need to be replaced. Also, the Brio G20-U RO’s smart faucet has 2 two handles that let you control which water you dispense. One lever dispenses PCB-filtered water, which produces no wastewater and is great for washing produce and watering plants. The other lever dispenses RO-purified water, which is perfect for drinking and making baby formula. This tankless reverse osmosis system makes managing your home’s natural-resource usage easy
- NSF/ANSI CERTIFIED FILTRATION: The PCB filter of the Brio G20-U Reverse Osmosis Water Filtration System has 3 stages—non-woven PP, coconut carbon fiber, and coconut carbon block—and is certified against NSF/ANSI 42 for CTO reduction. The RO membrane, with a pore size of 0.0001 microns, is certified against NSF/ANSI 58 for TDS reduction. Together, these filters significantly reduce sediment, chlorine, iron, TDS, PFAS, atrazine, lead, arsenic, nitrates, fluoride, radium, and more. So, if you’re concerned about the quality of your tap water, you can count on the Brio tankless under sink RO system to produce delicious, reliably purified water for you and your whole family
- FILTER REPLACEMENT: Depending on the quality of your water source, the PCB filter should be replaced every 6 to 12 months. Put B0B638RQD9 in the search bar for the PCB replacement filter. The RO filter should be replaced every 12-24 months. Put B0B5YHK23J in the search bar for the RO replacement filter. You won’t need tools or have to move the G20-U to change the filters. Filters are removed and installed from the front with a quick quarter turn
- 700 GPD & 2:1 PURE-TO-DRAIN RATIO: The Brio water filtration system delivers a fast and robust water flow, producing up to 700 gallons of purified water per day and dispensing 1 cup of water in under 8 seconds, so purified refreshment is always available on demand. And compared to traditional 1:4 under sink systems, the Brio tankless system has a low 2:1 pure-to drain ratio, which means that for every 2 cups of purified water dispensed, only 1 cup of wastewater is produced, saving over 300% on water waste compared to a 1:4 under sink tank system
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9.3
3Brio
Brio Reverse Osmosis Water Filtration System, 500 GPD, 2:1 Pure to Drain, Tank-Less, Under Sink Faucet Mount
Why we love it
The faucet has a long reach, so you can dispense water into the sink and not onto the counter.
The 4 in 2 filtration system reduces dirt, rust, and chlorine.
The reverse osmosis system produces up to 500 gallons per day of purified water.
Main highlights- WHAT’S INCLUDED: RO under sink filtration system, dual-levered smart faucet, PCB filter, RO filter, installation kit, user manual
- SPACE-SAVING DESIGN: Sleek and modern, the Brio G10-U RO system measures 5.2” W x 16.5” H x 18.2” D and takes up approximately 30% of typical under sink space, preserving 70% for storage. The innovative tankless filtration design has an integrated system that’s leak-proof and resists recontamination, a hazard for a reverse osmosis under sink system with a tank
- SMART FAUCET WITH 2 FILTRATION OPTIONS: The LED smart faucet features a TDS meter, so you know what the TDS level is in your RO-purified water, and a filter life reminder that shows the percentage of filter life left, so you know exactly when filters need to be replaced. Also, the Brio G10-U RO’s smart faucet has 2 two handles that let you control which water you dispense. One lever dispenses PCB-filtered water, which produces no wastewater and is great for washing produce and watering plants. The other lever dispenses RO-purified water, which is perfect for drinking and making baby formula. This tankless reverse osmosis system makes managing your home’s natural-resource usage easy
- REPLACEMENT FILTERS: For replacement filters search for “Brio RPFROSL500PCB” 3-Stage Filter & “Brio RPFROSL500RO“ Reverse Osmosis Filter
- NSF/ANSI CERTIFIED FILTRATION: The PCB filter of the Brio G10-U Reverse Osmosis Water Filtration System has 3 stages—non-woven PP, coconut carbon fiber, and coconut carbon block—and is certified against NSF/ANSI 42 for CTO reduction. The RO membrane, with a pore size of 0.0001 microns, is certified against NSF/ANSI 58 for TDS reduction. Together, these filters significantly reduce sediment, chlorine, iron, TDS, PFAS, atrazine, lead, arsenic, nitrates, fluoride, radium, and more. So, if you’re concerned about the quality of your tap water, you can count on the Brio tankless under sink RO system to produce delicious, reliably purified water for you and your whole family
- FILTER REPLACEMENT: Depending on the quality of your water source, the PCB filter should be replaced every 6 to 12 months. Put B0B638RQD9 in the search bar for the PCB replacement filter. The RO filter should be replaced every 12-24 months. Put B0B5YHK23J in the search bar for the RO replacement filter. You won’t need tools or have to move the G10-U to change the filters. Filters are removed and installed from the front with a quick quarter turn
- 500 GPD & 2:1 PURE-TO-DRAIN RATIO: The Brio water filtration system delivers a fast and robust water flow, producing up to 500 gallons of purified water per day and dispensing 1 cup of water in under 8 seconds, so purified refreshment is always available on demand. And compared to traditional 1:4 under sink systems, the Brio tankless system has a low 2:1 pure-to drain ratio, which means that for every 2 cups of purified water dispensed, only 1 cup of wastewater is produced, saving over 300% on water waste compared to a 1:4 under sink tank system
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At bestchoice.com, our team curates a selection of top products from a vast array available online, using a sophisticated ranking system based on carefully defined criteria.While traditional hands-on testing has its merits, our use of AI technology offers distinct advantages. AI allows us to process and analyze vast amounts of data from multiple sources, providing a comprehensive view that goes beyond what manual testing can achieve. This approach enables us to deliver insights that are aligned with current trends and consumer preferences, ensuring our reviews are both relevant and up-to-date.
Features
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Consumer Reviews
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Popularity
Our system also considers the popularity of products, analyzing factors such as market presence, reputation, and user satisfaction. By leveraging AI, we capture a comprehensive picture of a product's standing in the market, which may not always be evident through traditional testing.
Value for money
AI allows us to compare products based on attributes like price, specifications, and user feedback, helping to determine their value for money. This data-driven approach offers an efficient and reliable way to assess how products stack up against one another in terms of cost-effectiveness.
