10 Best Reverse Osmosis Systems in the UK
Tested and Reviewed: Top 10 Reverse Osmosis Systems deals with expert ratings from 8.1 to a perfect 10
August 2025 Edition
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1
Editor's Choice9.7
FRIZZLIFE
Frizzlife WB99-H Countertop Reverse Osmosis System, Instant Hot Water Dispenser, Alkaline RO Water Filter, NSF/ANSI 58 Certified Elements, Adjustable Temp & Volume, TDS & Filter Life Monitoring
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Editor's bottom line:
“This reverse osmosis systems is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”
Main Highlights
- 0.0001 Micron RO + LED Filtration & AlkalineBy combining carbon fiber, 100 Gallon RO membrane, alkaline particles and LED purification technology, Frizzlife WB99-H countertop reverse osmosis system can 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.
- Instant Heating, Multiple Temp & Dispensing Volume OptionsBesides room temp water, WB99-H RO filter system also provides heated water in a snap! The heated temperature range is between 45°C - 100°C. Tap + and - on the screen to adjust the specific temp you need. It allows you to brew a variety of drinks that deliver best tastes, including but not limited to hot tea, coffee, baby formula, etc.It also features with multiple volume options: 120ml,250ml,500ml and continuous dispensing.
- Real-Time TDS, Filter Life & Water Quality MonitoringThe 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 WaterThe 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-H reverse osmosis water filter 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.
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Picked by 347 people today
2
9.5
iSpring
iSpring RCC1UP-AK 100GPD Under Sink 7-Stage Reverse Osmosis RO Drinking Filtration System and Ultimate Water Softener with Alkaline Remineralization, Booster Pump and UV Ultraviolet Filter
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Main Highlights
- QUALITY 7-STAGE FILTRATION: This Reverse Osmosis (RO) water filtration system removes up to 99% of over 1,000 harmful contaminants like chlorine, fluoride, lead (removes up to 98%), arsenic, asbestos, calcium, sodium, and more.
- BOOSTER PUMP: Reverse Osmosis produces filtered drinking water by pressurizing water molecules through RO membrane and leaving impurities out. Equipped with an electric booster pump enables standard RO performance regardless of pressure variations; delivering higher throughput with less wastewater in comparing to pumpless models.
- UV FILTER STAGE: The UV stage comes with a smart Flow Sensor Switch turns the UV unit on and off with 3 minutes delay automatically with water flow, saving power and lengthening the life of the UV lamp.
- FEATURES: Come with European-Style brushed nickel kitchen faucet with the rust-free finish. The 1st stage has see-through housing that enables convenient visual inspection of filter condition. Our water filter features 3 pre-filters (to remove large contaminants and protect RO filter from chemicals) (RO) filter (to remove contaminants down to 0.0001 microns), and (AK) filter to finally restore just the right proportion of healthy minerals and a natural balance.
- DO-IT-YOURSELF INSTALLATION: Typically, in a couple of hours with industry-leading help just a phone call away. Fits under a standard kitchen sink, with all parts included and instructions and videos. For leak-free installation, simply push the tubing into quick-fitting connectors and lock; no threading pipes needed. iSpring water softener is equipped with quality components to ensure reliability and low maintenance for many years to come.
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3
9.5
FRIZZLIFE
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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Main Highlights
- 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 PD600TAM3 produces healthiest and greatest tasting water for you.
- 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!
- 1:1.5 Low Drain to Pure 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!
- Smart LED Display & Quick Change: The smart display panel clearly tells real-time out TDS and remaining lifespan of each filter. With all parts included and well-organized instructions and videos, Frizzlife PD600 RO filter can be completely installed in a few minutes by yourself.
- No Tank Design Under Sink Reverse Osmosis System: Frizzlife PD600 adopts a tankless design. A compact and sleek filter system with a small and convenient footprint takes up less space, saves storage under the kitchen sink! No tank also means no more secondary pollution. Guaranteed to provide ultra-pure, safe, and clean water for you and your family.
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4
9.2
iSpring
iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White
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Main Highlights
- [400 GPD & 2.5:1 Pure Wastewater Ratio] - The iSpring Under Sink Reverse Osmosis Water Filter System RO400 has a 2.5:1 pure wastewater ratio, which is up to 400% more water efficient than traditional under sink RO systems. Tankless reverse osmosis systems flow up to 0.4 GPM with minimal waste, and RO water filtration systems take less than 8.5 seconds to fill a glass of water.
- [Highest Impurity Removal Rate] - The under-sink RO water filter system converts tap water into clean RO drinking water. The 4-in-1 PCT filter removes up to 99% of more than 1,000 harmful contaminants such as chlorine, fluoride, lead (up to 98%), arsenic, asbestos, calcium, sodium, sediment, sand, odours, etc. The TDS removal rate is up to 99%.
- [Built-in Filter Life Indicator] - The Filter Life Indicator stays blue and starts flashing red when less than 5% of the corresponding filter life is left, and changes to red when the filter needs to be replaced. It is recommended that filters be replaced on a scheduled basis to maintain high performance filtration. You can find replacement filters by searching for FPCT400 and MRO400EU.
- [Easy to Install and Maintain] - All-in-one water line technology makes the reverse osmosis water filtration system easy to install on your own. It can be installed under a sink and the tankless design saves up to 70% of space.
- [Clean Mode] - Press Press the "Flush" button it will flush the reverse osmosis membrane for 30 seconds to extend its life.
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5
9.0
iSpring
iSpring RCC7AK 6 Stage Reverse Osmosis Water System Under Sink with Alkaline Remineralization, NSF Certified, 75 GPD, TDS Reduction
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Main Highlights
- Certified to NSF/ANSI 58: 6-Stage Alkaline Remineralization Layered Filtration - Exclusively designed to restore the natural alkalinity and mineral balance of water; this reliable and ultra-safe Reverse Osmosis (RO) water filtration system converts your water into clean, pure and healthy drinking water by removing up to 99% of over 1,000 harmful contaminants like chlorine, fluoride, lead (removes up to 98%), arsenic, asbestos, calcium, sodium and more.
- GREAT-TASTING MINERAL WATERA standard 5 stage RO system produces slightly acidic water with a pH of 7. 0 or below because the RO membrane removes not only harmful pollutants but also a few helpful minerals. The iSpring RCC7AK Reverse Osmosis water filter includes an additional 6th stage - an Alkaline Remineralization filter which restores healthy minerals and produces a balanced alkalinity, which gives your water a more natural taste than regular 5 stage RO water filter.
- LOW MAINTENANCETransparent 1st stage housing for easy visual inspection. Three extra long life pre-filters to remove large contaminants and protect RO membrane. Ultra fine (RO) filter to remove contaminants down to 0. 0001 microns; fine GAC filter to provide final polishing to the purified water and (AK) filter to finally restore just the right proportion of healthy minerals and a natural alkaline balance. The end result is great-tasting bottled-water quality.
- EASY TO INSTALL & NO LEAKS: The water purifier is designed for do-it-yourself installation and all necessary parts for installation are included. Backed by clear installation manual, instructional videos, and access to life-time technical support. The entire alkaline water filter fits nicely under a kitchen sink. For leak-free installation, simply push tubing ½ inch deep into quick-fitting connectors and lock; no threading pipes needed.
- 100% SATISFIED CUSTOMERS: RCC7AK from Americas favorite brand of under sink water filter is the highly rated reverse osmosis systems. Comes with 1-year limited manufacturer warranty upon registration and lifetime personalized support from GA, USA, combined with premium quality components, this water filter is to deliver endless bottled quality drinking water right in your home for many years to come, eliminating plastic waste.
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6
8.8
Waterdrop
Waterdrop Reverse Osmosis Water Filtration System, TDS Reduction, Tankless, 1514 Liters/Day Fast Flow, Reduces TDS and Water Hardness, 1:1 Pure to Drain, FCC Listed, Brushed Nickel Based Faucet
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Main Highlights
- / & - & & : & & Two filters are included in the package. Search "WD-G2P600" for replacement filters.
- : As an upgraded reverse osmosis system, the G2 P600 Ro water filtration system produces 600 gallons of filtered water per day. With a fast and stable water flow rate, this RO system fills a 200ml cup with water in 8 seconds, which is ideal for drinking, washing vegetables and fruit. The G2 P600 Ro water filter system also meets the water needs of big families and companies.
- : The G2 P600 reverse osmosis system reduces your replacement cost and upgrades the water-saving technology with a drain ratio of 2:1. Dispensing 2 cups of pure water will produce only 1 cup of waste water. Compared to traditional RO water purifiers, the G2 P600 RO system saves 600% more water. Note that all RO systems will produce waste water to discharge impurities. You can use waste water to mop the floor, wash your car, do laundry, etc.
- : This tankless Ro water filtration system saves 70% of your under-sink space and prevents recontamination. You can finish the installation by yourself in 30 minutes. Due to the filters twist-and-pull design, you can change a filter in 3 seconds without moving the system or using any tools. In addition, the filter life indicators will remind you to replace the filter in advance.
- : Waterdrop has upgraded the water circuit and product integration design, thereby improving product safety. Also, the G2 P600 RO water filtration system has automatic water shut-off valves, which reduces the risk of leakage. Because of the fully enclosed design, this RO systems noise does not exceed 55dB. NOTE: Drilling holes and an electrical outlet is required to operate the RO system.
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7
Best Value8.6
Save 6%
Waterdrop
Waterdrop K19 Countertop Reverse Osmosis Water Filter System, Instant Hot Water Dispensers, Portable No Installation, 4 Temperature Options, Reduce TDS, 5-Stage with UV, WD-K19-H
6% OffFree Shipping
Main Highlights
- [Compatible Filter] Model number: WD-K19RF
- [Heating and purification 2 in 1] The K19-H RO instant hot water dispenser integrates purification and heating, and it not only has RO reverse osmosis filtration capability, but also has 4-mode temperature options. The hot water dispenser allows temperature adjustment by 5 in the range of 45-95 to meet multiple water demands.
- [V-heating technology] The K19-H RO hot water dispenser adopts an innovative heating technology, and can dispense hot water within 1 second. The hot water dispenser produces no limescale by its outstanding filtration capability and also avoids reboiling water by its instant hot design.
- [Plug and use] The countertop RO reverse osmosis water filter system is installation-free and requires no drilling. All that requires is a socket and you can have pure water anywhere, from the bedroom to your office. The countertop water filter system is an excellent choice for renters as there is no need to drill a hole on your countertop. NOTE: An electrical outlet is required to operate the RO system, and the machine wire is 70.87 inches.
- [5-stage deep filtration] The 3-in-1 filter of the RO instant hot and water dispenser is built with an RO reverse osmosis membrane, a carbon block and PP cotton, and can effectively reduce TDS, chromium, pfas, fluoride, arsenic, salt, heavy metals, nitrate, particles, chloride, and other harmful substances through fine filtration layer by layer to achieve deep purification, ensuring every drop is purified water.
- [Water saving and cost saving] The countertop water filter system K19-H has an impressive 3:1 drain ratio and reduces water consumption with a drain water recycling technology. The filter can last up to 12 months.
- [Note] In order to improve the water utilization rate, please fill the feed water tank with water as far as the Max mark every time.
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8
8.3
Finerfilters
Finerfilters 6 Stage Reverse Osmosis Water Filter System with Booster Pump (50GPD) for Under Sink Home Domestic, Removes up to 99% of Contaminants and Remineralises to Replenish Essential Minerals
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Main Highlights
- Purchase the Finerfilters 6 Stage Reverse Osmosis Water Filtration System with Diaphragm Booster Pump for the very best drinking water every time you open the tap. RO water can help to produce tastier and more aromatic teas, coffees and juices, cleaner tasting foods, contaminant free, crystal clear ice cubes and is often cleaner, safer and cheaper than even most bottled water.
- This under sink RO water filter and water softener system is capable of removing the vast majority of contaminants and total dissolved solids (TDS) which can be found in drinking water including, but not limited to; fluoride (up to 98%), lead (up to 98%), bacteria (99+%), mercury (up to 98%), nitrates (up to 99%), chlorine (98+%), calcium (up to 98%), sodium (up to 98%), and much more!
- This superb system produces up to 190 Litres per day of purified water and comes with 3 US gallon storage tank, Chrome faucet tap, all tubing, filters, and fittings required for easy installation. A DIY installation manual is also provided. Please ensure to read this thoroughly beforehand.
- Pre and post filters consist of; 5µm PP Sediment filter (Removes Dirt, Sand and Rust) ¦ GAC Filter (Removes Chlorine, THMS, VOCs & Pesticides) ¦ CTO Carbon Block Filter (Further removes Chlorine etc.) ¦ Inline Post Carbon Filter (Removes residual impurities) ¦ Remineral filter (Enriches the water ions with health essential minerals) These are to be changed every 6 months. ¦ RO Membrane (Removes up to 99% of contaminants) can last between 1 - 2 years depending upon incoming water quality.
- This system requires a power source for the booster pump and uses a UK 3-Pin Plug. Operational with 0-BAR Water pressure! | System Dimensions: Height: 51cm, Width: 38cm, Depth: 19cm ¦ Tank: Diameter: 26cm, Height 34cm ¦ Replacement filters can be found by searching for ASIN: B01N0QSGMF (no membrane) OR B01N6GS8P9 (with membrane) OR B01N5FDTW0 (membrane only)
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9
8.1
Filterelated
Filterelated 4-Stage Aquarium Reverse Osmosis System with Flushing Valve Portable RO+DI deionized Water Filtration,Colour Changing DI Filter,100GPD (4-Stage 100GPD)
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Main Highlights
- 4-stage reverse osmosis system aquarium: PP cotton+activated carbon cartridge+RO reverse osmosis membrane+DI resin filter.Filter Precision down to 0.0001 micron, Reduce arsenic,lead,fluoride,mercury,cadmium and more,Special design for your aquariums use or residential use.
- Reduce ppmThe last stage mixing bed DI Filter is used to further remove TDS from membrane filtered water, guaranteed TDS approaching 0 ppm.This DI resin is color changing, it changes color from purple/blue to brown, the cartridge needs to be replaced
- 100 GPD /with flushing valve: 100 gallons per day at 60 psi. RO membrane is NSF certificated, to provide healthy and pure water. Quick Connections make it easy to remove and replace filters cartridges. When using it for the first time, rinse the RO diaphragm filter for five minutes and set the flushing valve to the ON position to start flushing. In the OFF position pure water is filtered. Make sure that only cold water enters the reverse osmosis system.
- Ensure the aquarium water is soft: With the Aquarium RO+DI system developed by our company, you can create an ideal ecosystem for fish that is similar to a natural ecosystem. It can professionally produce deionized pure water for your aquarium. Suitable for freshwater or saltwater fish. Better water quality with this gentle approach
- Special design for your aquarium use or home use: you can install it anywhere. The device's small footprint makes it easy to place under cabinets or in confined places. Perfect not only for aquarium use, apartments, motorhomes, business trips, holidays, yachts, boats or anywhere you need pure water, but also for applications such as apartments or rental properties where fixed installation is not possible.
- Complete accessories: All accessories necessary for operation included. Each step is explained in detail in the English operating instructions. You can also watch the provided videos that will help you. Comes with clips and expansion screws so you can attach it to the wall. It also comes with a 13 foot hose for you to cut to the length you want.
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10
8.1
FRIZZLIFE
FRIZZLIFE Aquarium Reverse Osmosis System Compact RO Water Filter System, 3-Stage Tropical Fish, Discus, Marine, Compatible with 190L, 280L or 380L GPD Membrane (190L)
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Main Highlights
- [Premium Sediment Cartridge] The first stage of the Frizzlife compact Reverse Osmosis system is the sediment filter made by high precision (10-micron) PP material that could perfectly remove most large particles including sands, dirt, debris and rust, and more from water. It is recommended to change per 6 months of usage.
- [Activated Carbon Block]The second stage of the RO water filter for Aquarium and water treatment is activated carbon block with superior quality and high precision at 5-micron. It could effectively further block out sediments and reduce 99% of chlorine, Cysts, VOCs, bad taste, and odors from water. Recommended changing per 6 months of usage. The 1st and 2nd pre-filters can greatly prolong the service life of the delicate 3rd stage - Reverse Osmosis Membrane.
- [Effective Reverse Osmosis Filtration]With a pore-size at 0.0001 microns, the final stage of the RO system- Reverse Osmosis Membrane - can eliminate more than 99.99% harmful contaminants (over 1000 kinds) including but not restrict to arsenic, lead, cysts, copper, fluoride from water, reducing Total Dissolved Solids (TDS) by over 99%. The purified water can perfectly meet your water needs for an aquarium with tropical fish, Discus, Marine, and more. Recommended changing per 12 months of usage.
- [Easy Installation and Replacement] The Compact RO water filter kit has been pre-assembled. By following the step-by-step user manual, it is super easy to be installed all by yourself within 10 min. The system package includes the RO water filter, a quick faucet connector, a faucet diverter, RO membrane housing wrench, lock clip wrench, and mounting screws. It allows you to feed the system whenever you need RO water. You could also mount it on the wall using provided screws.
- [50 GPD and Convenient Use] With the capacity of 50 GPD, the 3-stage Reverse Osmosis Water Filtration System for Aquarium could produce 50 gals. of filtered RO water, sufficiently serving your fish, plants, and pets on daily basis. Connect and open the faucet whenever you need RO water. Compatible with M22, F24, and 3/4 male thread faucet. The RO system package also provides a T faucet diverter that you could use both of your tap and the RO system in the same time.
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