Best water filters, compared
Water filter systems from the UK retailers we track — reverse osmosis, ceramic gravity systems, under-sink and countertop units — ranked by value and specification with live prices. Replacement cartridge cost matters as much as the headline price; both are in the comparison.
Independent comparison: we may earn a commission when you buy through links on this page. It never affects how we rank products — see our method.
| # | Product | Our rating | Best price | Retailers | Dimensions (cm) | Features |
|---|---|---|---|---|---|---|
| 1 | 52 | £20.83 | Waterdropfilter UK | — | canopy | |
| 2 |  British Berkefeld® Ultra Sterasyl® (8674) - One British Berkefeld | 51 | £23.95 | Doulton | — | canopy |
| 3 |  British Berkefeld® Stainless Steel Stand - 6L British Berkefeld | 51 | £25.95 | Doulton | — | canopy |
| 4 | 50 | £27.49 | Waterdropfilter UK | — | storage | |
| 5 | 49 | £33.33 | Waterdropfilter UK | — | storage | |
| 6 | 48 | £36.45 | Doulton | — | canopy | |
| 7 | 47 | £39.95 | Doulton | — | desk | |
| 8 | 45 | £48.95 | Doulton | — | canopy | |
| 9 | 45 | £49.95 | Doulton | — | desk | |
| 10 | 45 | £49.99 | Waterdropfilter UK | — | canopy | |
| 11 | 43 | £58.33 | Waterdropfilter UK | — | canopy | |
| 12 |  British Berkefeld Black Rubber Sealing Filter Washer British Berkefeld | 42 | £2.95 | Doulton | — | |
| 13 |  British Berkefeld Black Universal Wing Nut British Berkefeld | 42 | £2.95 | Doulton | — | |
| 14 |  British Berkefeld Blanking Seals (Grommets) British Berkefeld | 42 | £6.95 | Doulton | — | |
| 15 |  British Berkefeld® Gravity Tap British Berkefeld | 42 | £9.95 | Doulton | — | |
| 16 | 42 | £14.16 | Waterdropfilter UK | — | ||
| 17 | 42 | £16.95 | Doulton | — | ||
| 18 | 42 | £21.66 | Waterdropfilter UK | — | ||
| 19 |  Waterdrop Chubby Water Filter Jugs and Cartridges with 1×90 Days Filter 10-cup, Long-lasting (200 Gallons) | 42 | £21.66 | Waterdropfilter UK | — | |
| 20 | 41 | £24.95 | Doulton | — | ||
| 21 |  F2 Filter for Waterdrop X Series Reverse Osmosis System Replacement For X12 & X16 & X8 | 41 | £24.99 | Waterdropfilter UK | — | |
| 22 | 41 | £24.99 | Waterdropfilter UK | — | ||
| 23 |  WD-G3-N3CB Filter for Waterdrop G3P600 & G3 Reverse Osmosis System Replacement For Wd-g3-w Reverse Osmosis Filtration System | 41 | £25.83 | Waterdropfilter UK | — | |
| 24 |  1 Year Lifetime WD-G2CF Filter for Waterdrop WD-G2/ WD-G2P600 Series Reverse Osmosis System Replacement For Wd-g2 Series Reverse Osmosis Filtration System | 41 | £25.83 | Waterdropfilter UK | — | |
| 25 |  CF Filter for Waterdrop G3P600 & G3 Reverse Osmosis System Replacement For Wd-g3-w Reverse Osmosis Filtration System | 41 | £25.83 | Waterdropfilter UK | — | |
| 26 | 41 | £25.95 | Doulton | — | ||
| 27 |  British Berkefeld® Stainless Steel Gravity Tap British Berkefeld | 41 | £25.95 | Doulton | — | |
| 28 | 41 | £66.66 | Waterdropfilter UK | — | storage | |
| 29 |  12-month Filter Lifespan Under Sink Replacement Water Filter for AS13 Waterdrop United Kingdom | 40 | £29.16 | Waterdropfilter UK | — | |
| 30 | 40 | £29.45 | Doulton | — | ||
| 31 | 40 | £29.95 | Doulton | — | ||
| 32 | 40 | £29.95 | Doulton | — | ||
| 33 | 40 | £70.83 | Waterdropfilter UK | — | storage | |
| 34 |  F1A Filter for Waterdrop X Series Reverse Osmosis System Expected To Be Available By The End Of May | 39 | £33.99 | Waterdropfilter UK | — | |
| 35 | 38 | £36.45 | Doulton | — | ||
| 36 | 38 | £36.45 | Doulton | — | ||
| 37 | 38 | £36.45 | Doulton | — | ||
| 38 | 38 | £36.45 | Doulton | — | ||
| 39 | 38 | £36.45 | Doulton | — | ||
| 40 | 38 | £36.45 | Doulton | — | ||
| 41 |  Waterdrop Electric Instant Water Filter Jug, 15-cup (3.5 L) Filtration Capacity / 3 Months - Blue Replacement Filter: Wd-edf | 37 | £39.99 | Waterdropfilter UK | — | |
| 42 |  Waterdrop C1RF Water Filter for WD-C1 Countertop RO System Waterdrop United Kingdom | 37 | £41.66 | Waterdropfilter UK | — | |
| 43 |  British Berkefeld® Ultra Fluoride (8B76) - One British Berkefeld | 36 | £43.95 | Doulton | — | |
| 44 |  Waterdrop WD-K19RF Replacement RO Filter for WD-K19-H Countertop Hot Water Dispensers Waterdrop United Kingdom | 33 | £58.33 | Waterdropfilter UK | — | |
| 45 |  M6RFG Replacement Filter For M6CG Countertop RO Dispenser Waterdrop United Kingdom | 33 | £58.33 | Waterdropfilter UK | — | |
| 46 |  Under Sink Water Filter | Direct Connect Filtration System UA - WD-10UA | 30K Liters Waterdrop 10ua( Filtration Accuracy Of 0.5 Μm.). Doesn't Reduce Tds | 32 | £62.49 | Waterdropfilter UK | — | |
| 47 | 31 | £64.16 | Waterdropfilter UK | — | ||
| 48 |  0.01 μm Ultra Filtration UnderSink Water Filter | Direct Connect Filtration System - 30000 Liters Replacement Filter: Wd-rf10-uf | 31 | £66.66 | Waterdropfilter UK | — | |
| 49 |  5+1 Stage Stainless Steel Direct Connect Under Sink Water Filter AS13（𝐍𝐨 𝐃𝐫𝐢𝐥𝐥𝐢𝐧𝐠 𝐑𝐞𝐪𝐮𝐢𝐫𝐞𝐝） Nsf/ansi 42&372 Certified, Reduce Pfas, Pfoa/pfos | 31 | £66.66 | Waterdropfilter UK | — | |
| 50 | 31 | £108.33 | Waterdropfilter UK | — | canopy | |
| 51 |  Waterdrop X12 RO System Replacement Filter Combo Set - 1200GPD - 1-YEAR COMBO Replacement For X12 & X16 | 30 | £71.65 | Waterdropfilter UK | — | |
| 52 |  WD-A2RF Filter for Waterdrop A2 Reverse Osmosis System, 2-YEAR COMBO Expected To Be Available By The End Of May | 30 | £112.50 | Waterdropfilter UK | — | canopy |
| 53 |  Waterdrop G3P600/G3 RO System Replacement Filters Set - 1-YEAR COMBO Replacement For Wd-g3p600 Reverse Osmosis Water Filter System | 29 | £74.15 | Waterdropfilter UK | — | |
| 54 | 29 | £116.66 | Waterdropfilter UK | — | canopy | |
| 55 | 28 | £119.95 | Doulton | — | canopy | |
| 56 |  2 Years Lifetime WD-G2P6MRO Filter for WD-G2P600-W Reverse Osmosis System Replacement For Wd-g2 Series Reverse Osmosis Filtration System | 27 | £83.33 | Waterdropfilter UK | — | |
| 57 | 25 | £91.66 | Waterdropfilter UK | — | ||
| 58 | 23 | £98.19 | Waterdropfilter UK | — | ||
| 59 | 23 | £99.99 | Waterdropfilter UK | — | ||
| 60 | 23 | £100 | Waterdropfilter UK | — | ||
| 61 | 22 | £190.83 | Waterdropfilter UK | — | canopy | |
| 62 |  Waterdrop G2P600 Tankless RO Water Filtration System – 600 GPD Fast Flow for Home Use Remove 99% Of Lead - Cleaner, Safer, Better | 22 | £249.99 | Waterdropfilter UK | — | canopy |
| 63 | 22 | £291.66 | Waterdropfilter UK | — | canopy | |
| 64 |  Waterdrop 600 GPD Fast Flow Reverse Osmosis System G3P600 Remove 99% Of Lead - Cleaner, Safer, Better | 22 | £458.32 | Waterdropfilter UK | — | storage |
| 65 |  WD-KJF Filter for Waterdrop K6 Reverse Osmosis Instant Hot Water Dispenser System Replacement For Wd-k6-w | 21 | £108.33 | Waterdropfilter UK | — | |
| 66 | 19 | £116.66 | Waterdropfilter UK | — | ||
| 67 |  Waterdrop G2P600 RO System Replacement Filters Set - 600 GPD Replacement For Wd-g2-w, Wd-g2-b, Wd-g2p600-w Ro Systems | 19 | £116.66 | Waterdropfilter UK | — | |
| 68 | 12 | £149.99 | Waterdropfilter UK | — | ||
| 69 |  X16-F3 Filter for Waterdrop X16 Reverse Osmosis System | 1600 GPD Replacement For X16 | 12 | £149.99 | Waterdropfilter UK | — | |
| 70 |  X12-F3 Filter for Waterdrop X12 Reverse Osmosis System | 1200 GPD Replacement For X12 | 12 | £159.99 | Waterdropfilter UK | — | |
| 71 | 12 | £161.95 | Doulton | — | ||
| 72 |  WD-KJF Filter for Waterdrop K6 RO System, 2-YEAR COMBO Replacement For Wd-k6-w | 12 | £174.98 | Waterdropfilter UK | — | |
| 73 |  Waterdrop G5P500 Reverse Osmosis Water Filtration System Remove 99% Of Lead - Cleaner, Safer, Better | 12 | £199.99 | Waterdropfilter UK | — | |
| 74 |  Waterdrop C1H Instant Hot Water Reverse Osmosis System Remove 99% Of Lead - Cleaner, Safer, Better | 12 | £249.99 | Waterdropfilter UK | — | |
| 75 |  Waterdrop Alkaline Countertop CoreRO System C1SL with Replacement Filter Combo Remove 99% Of Lead - Cleaner, Safer, Better | 12 | £273.33 | Waterdropfilter UK | — | |
| 76 |  Waterdrop G2P600 Remineralization RO Water Filtration System for Home Model：wd-g2p600-w-mz | 12 | £278.32 | Waterdropfilter UK | — | |
| 77 |  The Ultimate British Berkefeld Starter Bundle British Berkefeld | 12 | £296.95 | Doulton | — | |
| 78 |  Waterdrop K19-HG Instant Hot Water Reverse Osmosis System with Replacement Filter Combo Remove 99% Of Lead - Cleaner, Safer, Better | 12 | £331.67 | Waterdropfilter UK | — | |
| 79 | 12 | £354.95 | Doulton | — | ||
| 80 |  K19-H Instant Hot Countertop RO System with an Extra One-Year Filter Combo Waterdrop United Kingdom | 12 | £358.32 | Waterdropfilter UK | — | |
| 81 | 12 | £374.17 | Waterdropfilter UK | — | ||
| 82 | 12 | £432.50 | Waterdropfilter UK | — | ||
| 83 | 12 | £486.65 | Waterdropfilter UK | — | ||
| 84 |  Waterdrop A1 Reverse Osmosis Hot Cold Water Dispenser Official Website Exclusive | 12 | £499.99 | Waterdropfilter UK | — | |
| 85 |  Waterdrop A1 Reverse Osmosis Hot Cold Water Dispenser with CF Replacement Filter Combo Remove 99% Of Lead - Cleaner, Safer, Better | 12 | £529.15 | Waterdropfilter UK | — | |
| 86 |  Waterdrop X Series Reverse Osmosis System, X8 Remove 99% Of Lead - Cleaner, Safer, Better | 12 | £582.50 | Waterdropfilter UK | — | |
| 87 | 12 | £682.46 | Waterdropfilter UK | — | ||
| 88 |  Waterdrop K6 Instant Hot Under Sink RO System with KJF Filter Waterdrop United Kingdom | 12 | £690.83 | Waterdropfilter UK | — | |
| 89 | 12 | £1,082.50 | Waterdropfilter UK | — | ||
| 90 | 12 | £1,166.47 | Waterdropfilter UK | — | ||
| 91 | 12 | £1,249.95 | Doulton | — | ||
| 92 |  Waterdrop X16 Alkaline Undersink Reverse Osmosis System Brushed Nickel Silver Faucet Version | 12 | £1,665.83 | Waterdropfilter UK | — | |
| 93 |  Waterdrop X16 Reverse Osmosis System with Replacement Filter Combo Brushed Nickel Silver Faucet Version | 12 | £1,749.80 | Waterdropfilter UK | — |
Why we rank it this way
Our default rating weights value for money and specification equally, then safety certification and how widely the product is stocked across retailers.
Weights: priceVsBand 30% · spec 30% · safetyCert 20% · availabilityBreadth 20% — full method on how we rank.
FAQs
- Reverse osmosis or ceramic filtration — what's the difference?
- Reverse osmosis forces water through a membrane and removes the widest range of contaminants (and minerals), usually needing mains pressure or a pump and producing some waste water. Ceramic filters physically strain bacteria and sediment while keeping minerals, need no power or plumbing in gravity form, and are cleanable rather than disposable.
- How often do filter cartridges need replacing?
- Typically every 6 months for carbon cartridges and 6–12 months for RO membranes and ceramic candles, depending on usage and water hardness. Factor the annual cartridge cost into the comparison — a cheap system with dear cartridges isn't cheap.
- Do I need a plumber to fit an under-sink filter?
- Confident DIYers manage most under-sink kits with a self-piercing valve or T-adapter in an hour; anything involving a separate filter tap through the worktop is more involved. Gravity and countertop systems need no plumbing at all.