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5 Best Reverse Osmosis Systems of 2025

Last Updated - 2025/04/28

1
Best Choice

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Waterdrop

Waterdrop G3P800 Reverse Osmosis System, 800 GPD Fast Flow, NSF/ANSI 42 & 53 & 58 & 372 Certified, 3:1 Pure to Drain, Tankless Under Sink RO Water Filter System, LED Purifier, Smart Faucet

Waterdrop

CA$1,199.00

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Main highlights
- 【Stylish look, tankless design】The RO system G3P800 has a stylish look. The tankless design saves under sink space and ensures the safety of water. The system can consistently produce water and ensures purity in every drop. You can get purified water anytime without waiting.
- 【Smart faucet】G3P800 is equipped with a smart faucet, by which you can get the TDS level and water quality at a glance. The lifespan of LED lamp is up to 50 years. The LED can be automatically turned on when water flows by.
- 【NSF/ANSI standard 42 & 53 & 58 & 372 certified】This tankless reverse osmosis system is certified by IAPMO R&T against NSF/ANSI 58 for reduction of TDS. Also it has been tested and certified against NSF 42 & 53 to reduce chlorine, bad taste, odor and so on. Besides, the system is certified by NSF/ANSI 372 for lead-free materials.
- 【800 GPD high capacity, 3:1 pure to drain ratio】The Waterdrop G3P800 reverse osmosis system offers a higher water capacity (800 gallons per day), thereby meeting demands of a big family for pure water. Furthermore, by high water flow, it filters one cup of water in just 5s. By an advanced water dispensing technology, this tankless RO water filter system produces just a cup of wastewater for every three cups of filtered water produced.
- 【10-Stage filtration】 Tested by official third-party laboratory (SGS), through 10-stage filtration, G3P800 can effectively reduce PFAS, fluoride, heavy metals like lead, chromium, iron, salts like nitrate and chloride as well as large particles and radioactive substances such as radium. Our RO system can reduce such as vinyl chloride, ethylhexyl acrylate, isobutylene, monobutyl ether, according to the reverse osmosis membrane technical manual.
- Drilling 2 holes for installation. One for RO faucet and the other for drain pipe connection.
CA$1,199.00
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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Waterdrop

Waterdrop G3P600 Reverse Osmosis System, NSF/ANSI 58 & 372 Certified, Tankless Under Sink RO System, RO Water Filter System, TDS Reduction, 600 GPD, Smart LED Faucet

Waterdrop

CA$699.00

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Main highlights
- [Trusted certifications] Waterdrop G3P600 reverse osmosis water filter system is certified against NSF/ANSI 58 for TDS reduction and NSF/ANSI 372 certified for lead-free material. The tankless reverse osmosis system is also certified by the Federal Communications Commission. Besides, it meets the EU Standards and UKCA Standards for safety.
- [Smart display faucet] The G3P600 under sink reverse osmosis is built with a smart display faucet. For instance, the TDS monitor tells you the quality of your filtered water, while the filter life tracker shows how soon you need to replace your filter. And we highly recommend using the Waterdrop authentic RO faucet as other brands may not be compatible with your system. If you have any doubts, please reach out to our customer service before buying.
- [8-stage Filtration] Tested by official third-party laboratory (SGS), the reverse osmosis system can effectively reduce TDS, chromium, PFAS, fluoride, arsenic salt, iron, calcium, particles, chloride, chlorine and heavy metals like hexavalent chromium in your tap water. And our RO water filter system can reduce chemicals such as vinyl chloride, ethylhexyl acrylate, isobutylene, ethylene glycol, according to the reverse osmosis membrane technical manual.
- [600GPD high capacity, 2:1 low drain ratio] As an upgraded reverse osmosis system, the G3P600 reverse osmosis water filter system produces 600 gallons of filtered water per day. By its low drain ratio, this system can produce only one cup of waste water for every two cups of pure water produced. Furthermore, with a fast and stable water flow rate, this RO system fills a 8 oz cup of water in 8 seconds, which is ideal for drinking and washing vegetables.
- Three filters are included in the package. Search "WD-G3P600" for replacement filters.
CA$699.00
3
20% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Express Water
20% Off

Express Water RO5DX Reverse Osmosis Filtration NSF Certified 5 Stage RO System with Faucet and Tank – Under Sink Water Plus 4 Filters – 50 GPD, 14 x 15 x 5, White

Express Water

CA$249.16

CA$311.81
(20% Off)

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Main highlights
- Water Purification System: Drink the healthiest water on Earth. All our water filters are specially engineered to work together, producing the safest and best tasting water you'll ever drink
- Under Sink Water Filter: Don't waste money on professional installation. Express Water's quick and easy-to-understand design means you can install and understand everything about your new water filtration system
- Under Sink Water Filter System: No need to mess with refilling or activating your water filter, Express Water's water filtration systems automatically fill your water tank with high quality drinking water
- Reverse Osmosis Water Filter: Experience what water should taste like with the Express Water reverse osmosis water filtration system reducing up to 99.99% of Lead, Chlorine, Fluoride, Nitrates, Calcium, Arsenic, and more.
- On Demand Support: Support from experts who can answer any of your questions about your new water filter
- Leak Detection: Each under sink water filter includes an emergency leak stop detector that shuts off water flow when it detects unwelcomed moisture
- Help Has Arrived - Support from experts who can answer any of your questions about your home's water
- Customizable RO Water Filter System: Express Water home water filtration systems are fully upgradable and customizable with quick connecting fittings. Try additional filtration attachments including UV Water Filter, Alkaline Water Filter, Deionization Water Filter, and more
CA$249.16
CA$311.81 (20% Off)
4
Best Value
28% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

FRIZZLIFE
28% Off

Frizzlife Countertop Reverse Osmosis System - WB99 Alkaline RO Water Filter with Portable Water Pitcher, NSF/ANSI 58 Certified Elements, 3.5:1 Pure to Drain, No Installation, USA Tech Support

FRIZZLIFE

CA$429.99

CA$599.99
(28% Off)

More Details
Main highlights
- 【Real-Time TDS, Filter Life & Water Quality Monitoring】The smart touch panel is sensitive and easy to operate. It will show the latest TDS result after each water production. Besides, this RO water filter system will keep monitoring the filter life and remind you to change filter cartridges in advance. Furthermore, if the filtered water in the pitcher has been over 24 hours, the water quality indicator will turn red. The user-friendly design allows you to forget the guesswork.
- 【Portable Pitcher With RO Water】The filtered water pitcher is portable and can be taken anywhere in need. There is no need to go to the system each time to fetch the water, just place the pitcher within reach. You can also put the pitcher into the refrigerator to get ice water! Thanks to its compact size (9"L x 16.5"W x 14.8"H), it can be placed in multiple scenarios, such as living room, office, bedroom, RV and more. The elegant design can also be harmoniously incorporated into the home decor.
- 【Plug and Use & Easy Replacement】 WB99-C reverse osmosis water filter system is built for convenience, it is fully assembled and requires ZERO installation. Just plug it in, fill up the water tank, then the system will automatically start to produce RO water right away! The twist-in design makes the filter replacement a breeze and no tools required. The system comes with full set of filter cartridges. For replacement filters, please search “ Frizzlife FCR100+ Filter” and “ Frizzlife SC90 Filter
- 【4 Dispensing Volume Modes & Large Water Tank】Frizzlife countertop RO system features with multiple dispensing volumes: 4oz, 8oz, 17oz and continuous dispensing. Simply tap the screen to select the desired volume. Please kindly note that the dispensing volume is subject to±10% deviation. The large filling tank (152 oz/4.5 L) can perfectly meet the water demand for a family or an office. The tank is also removable, thus makes it effortless for water refilling and cleaning.
- 【0.0001 Micron RO Filtration & Alkaline pH+】By combining carbon fiber, 100 Gallon RO membrane and alkaline particles, Frizzlife WB99-C countertop reverse osmosis system can effectively reduce 1000+ harmful contaminants (99.99%), including Chlorine, Fluoride, Lead & other Heavy Metals, Arsenic, Chloramine, TDS, limescale, VOCs and much more. The SC90 alkaline filter addresses the side-effect of RO water and raises the PH value, which is beneficial to long-term health.
CA$429.99
CA$599.99 (28% Off)
5
20% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

FRIZZLIFE
20% Off

Frizzlife RO Reverse Osmosis Water Filtration System - 600 GPD High Flow, Tankless, Reduce TDS, Compact, Alkaline Mineral PH, 1.5:1 Drain Ratio, USA Tech Support, PD600-TAM3

FRIZZLIFE

CA$455.99

CA$569.99
(20% Off)

More Details
Main highlights
- Smart LED Display & Quick Change: The smart display panel clearly tells real-time out TDS and remaining lifespan of each filter. The built-in TDS system constantly monitors the quality of your drinking water 24/7. Acting as a intelligent reminder, the color-coded indicators will always remind you to change filters in advance. With all parts included and well-organized instructions and videos, Frizzlife PD600 RO filter can be completely installed in a few minutes by yourself.
- Remineralization & Alkalization: The water from RO membrane is slightly acidic, which also removes natural mineral. The 3rd stage of filter solves both issues of conventional RO systems! It balances the alkalinity of RO water and adjusts the PH to more than 7.5. Drinking weakly alkaline water is beneficial to your health. It also restores health-benefiting essential minerals to your water. Frizzlife PD600 produces healthiest and greatest tasting water for you.
- No Tank Design: Frizzlife PD600 undersink filtration adopts tankless design. Compact and sleek filter system with a small and convenient footprint takes up less space, saves storage under kitchen sink! No tank also means no more secondary pollution. Guaranteed to provide ultra-pure, safe and clean water for you and your family.
- 600 GPD High Water Flow: PD600 filter system adopts internal prompt and can produce 600 gallons water per day. High capacity can serve the daily water needs of large family. Water flow is fast and stable, the system can fill a 330ml cup of water in about 10 seconds. Get a full cup of fresh RO water in a snap!
- 1.5:1 Low Drain Ratio: Thanks to advanced water-saving technology, Frizzlife PD600 RO system maximizes the efficiency and can save your water up to 450% compared with conventional RO filter systems on market! Being both economic and environmental friendly, it makes your water bills more affordable. Over the life of the system, PD600 RO filter system pays for itself in water savings!
CA$455.99
CA$569.99 (20% Off)

5 Best Reverse Osmosis Systems of 2025

Waterdrop G3P800 Reverse Osmosis System, 800 GPD Fast Flow, NSF/ANSI 42 & 53 & 58 & 372 Certified, 3:1 Pure to Drain, Tankless Under Sink RO Water Filter System, LED Purifier, Smart Faucet

Waterdrop G3P600 Reverse Osmosis System, NSF/ANSI 58 & 372 Certified, Tankless Under Sink RO System, RO Water Filter System, TDS Reduction, 600 GPD, Smart LED Faucet

Express Water RO5DX Reverse Osmosis Filtration NSF Certified 5 Stage RO System with Faucet and Tank – Under Sink Water Plus 4 Filters – 50 GPD, 14 x 15 x 5, White

Frizzlife Countertop Reverse Osmosis System - WB99 Alkaline RO Water Filter with Portable Water Pitcher, NSF/ANSI 58 Certified Elements, 3.5:1 Pure to Drain, No Installation, USA Tech Support

Frizzlife RO Reverse Osmosis Water Filtration System - 600 GPD High Flow, Tankless, Reduce TDS, Compact, Alkaline Mineral PH, 1.5:1 Drain Ratio, USA Tech Support, PD600-TAM3

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