TerracottaTroveIndependent UK price comparison

Home / Water Filters / Best water filters, compared

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.

Showing 1–94 of 94, ranked by our score.

#ProductOur ratingBest priceRetailersDimensions (cm)Features
1
71£20.83Waterdropfilter UK—3-stageundersinktwist-lockcarbon-filtrationkdf
2
70£27.49Waterdropfilter UK—undersinkcompacttool-free-installationrv-compatible
3
F1A Filter for Waterdrop X Series Reverse Osmosis System
Expected To Be Available By The End Of May
69£28.33Waterdropfilter UKW8.79 × L8.79 × H42.7quick-changetool-free-installationremineralisation
4
66£39.95Doulton—filterinsulatedhandlebpa-freereusable
5
64£49.95Doulton—insulatedfilterhandlebpa-free
6
60£24.95Doulton—filterdual-filter
7
59£66.66Waterdropfilter UKW9.1 × L9.8 × H31.2dedicated-faucetundersinkno-electricityportablekdf-filter
8
59£66.66Waterdropfilter UK—direct-connectunder-sinkno-drilling-requiredstainless-steel
9
58£70.83Waterdropfilter UKW9.144 × L9.779 × H31.242undersinkdedicated-faucetcompact
10
52£6.95Doulton—waterproof
11
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
51£58.33Waterdropfilter UKW9.1 × L9.8 × H31.2undersinkdirect-connect
12
51£21.66Waterdropfilter UK—lead-free
13
51£23.95Doulton—canopy
14
WD-G3-N3CB Filter for Waterdrop G3P600 & G3 Reverse Osmosis System
Replacement For Wd-g3-w Reverse Osmosis Filtration System
50£25.83Waterdropfilter UKW6.6 × L6.6 × H30.7carbon-block
15
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
50£25.83Waterdropfilter UKW12.4 × L12.4 × H20.6replacement
16
50£25.95Doulton—canopy
17
50£64.16Waterdropfilter UK—reverse-osmosis5-stage-filtration
18
48£33.33Waterdropfilter UK—storage
19
48£108.33Waterdropfilter UK—3-stageunder-sinkdirect-connectcarbon-filtrationkdftwist-locktool-free
20
47£36.45Doulton—canopy
21
44£48.95Doulton—canopy
22
42£2.95Doulton—
23
42£2.95Doulton—
24
42£9.95Doulton—
25
42£16.95Doulton—
26
42£149.99Waterdropfilter UK—without-standgravitystainless-steel
27
42£190.83Waterdropfilter UK—hot-coldfiltrationsmart-indicatorscustomizable-settingsultra-capacity
28
42£249.99Waterdropfilter UKW44.02 × L15.01 × H35.51tankless7-stage-filtrationmechanical-faucet
29
Waterdrop C1H Instant Hot Water Reverse Osmosis System
Remove 99% Of Lead - Cleaner, Safer, Better
42£249.99Waterdropfilter UKW29.7 × L21.1 × H34.8heatingfiltrationtouch-screenchild-lockportable-tankinstallation-free
30
42£291.66Waterdropfilter UKW21.41 × L46.51 × H47.8tanklessalkaline-mineralizationsmart-faucetleak-free8-stage-filtration
31
42£296.95Doulton—gravityno-plumbingshower-filter
32
42£354.95Doulton—under-sinkthree-stage-filtrationbiotect-ultra-filter
33
42£374.17Waterdropfilter UKW40.4 × L20.8 × H39.9hot-coldreverse-osmosistouch-screenportablechild-locksmart-control5-stage-filtration
34
Waterdrop 600 GPD Fast Flow Reverse Osmosis System G3P600
Remove 99% Of Lead - Cleaner, Safer, Better
42£458.32Waterdropfilter UKW14.4 × L46 × H45tanklesssmart-faucetuv-sterilization
35
42£499.99Waterdropfilter UKW46.5 × L19.8 × H43.4hot-coldfiltrationuv-sterilizationsmart-displaychild-lockcountertop
36
42£529.15Waterdropfilter UKW46.5 × L19.8 × H43.4hot-coldfiltrationuv-sterilizationsmart-displaychild-lock
37
Waterdrop X Series Reverse Osmosis System, X8
Remove 99% Of Lead - Cleaner, Safer, Better
42£582.50Waterdropfilter UKW15.88 × L46.23 × H42.47tanklesssmart-faucetreal-time-monitoringself-cleanholiday-mode
38
42£690.83Waterdropfilter UK—tanklesshot-waterro-filtrationsmart-faucetdigital-displayscale-inhibitionrapid-heating
39
42£1,082.50Waterdropfilter UKW15.9 × L46.2 × H42.5alkaline-mineralizationuv-sterilizationsmart-faucettanklesstds-monitorfilter-life-reminder
40
42£1,249.95Doulton—gravityceramic-filterswooden-standstainless-steel-taplimited-edition
41
42£19.95Doulton—
42
40£24.99Waterdropfilter UKW10.8 × L10.8 × H42.7
43
40£24.99Waterdropfilter UK—
44
CF Filter for Waterdrop G3P600 & G3 Reverse Osmosis System
Replacement For Wd-g3-w Reverse Osmosis Filtration System
40£25.83Waterdropfilter UKW8.4 × L8.4 × H30.7
45
40£25.95Doulton—
46
39£29.16Waterdropfilter UK—
47
39£29.16Waterdropfilter UK—
48
39£66.66Waterdropfilter UKW9.14 × L9.78 × H42.42under-sink
49
39£29.45Doulton—
50
39£29.95Doulton—
51
39£29.95Doulton—
52
38£33.33Waterdropfilter UK—
53
37£36.45Doulton—
54
37£36.45Doulton—
55
37£36.45Doulton—
56
37£36.45Doulton—
57
37£36.45Doulton—
58
37£36.45Doulton—
59
36£41.66Waterdropfilter UK—
60
36£116.66Waterdropfilter UKW10.998 × L10.998 × H37.998reverse-osmosiswater-saving
61
Waterdrop G2P600 RO System Replacement Filters Set - 600 GPD
Replacement For Wd-g2-w, Wd-g2-b, Wd-g2p600-w Ro Systems
36£116.66Waterdropfilter UKW12.45 × L12.45 × H20.57quick-replaceeasy-install
62
35£43.95Doulton—
63
34£49.99Waterdropfilter UK—
64
33£91.66Waterdropfilter UKW10.9 × L10.9 × H38.1reverse-osmosis
65
32£149.99Waterdropfilter UKW15 × L15 × H43.3under-sinkeasy-maintenance
66
32£331.67Waterdropfilter UK—instant-hot-waterreverse-osmosis
67
32£57.50Waterdropfilter UK—
68
31£58.33Waterdropfilter UK—
69
31£58.33Waterdropfilter UK—
70
31£58.33Waterdropfilter UK—
71
31£58.33Waterdropfilter UK—
72
30£100Waterdropfilter UK—bpa-free
73
28£71.65Waterdropfilter UK—
74
Waterdrop G3P600/G3 RO System Replacement Filters Set - 1-YEAR COMBO
Replacement For Wd-g3p600 Reverse Osmosis Water Filter System
27£74.15Waterdropfilter UK—
75
27£74.17Waterdropfilter UK—
76
27£112.50Waterdropfilter UK—canopy
77
26£116.66Waterdropfilter UK—canopy
78
25£119.95Doulton—canopy
79
2 Years Lifetime WD-G2P6MRO Filter for WD-G2P600-W Reverse Osmosis System
Replacement For Wd-g2 Series Reverse Osmosis Filtration System
25£83.33Waterdropfilter UKW12.4 × L12.4 × H38.1
80
22£486.65Waterdropfilter UK—mineral-filter
81
20£99.99Waterdropfilter UK—
82
18£108.33Waterdropfilter UKW42.4 × L16 × H16
83
12£133.32Waterdropfilter UKW15 × L15 × H43.3
84
12£161.95DoultonW19.4 × L19.4 × H47.3
85
12£174.98Waterdropfilter UKW16 × L42.4 × H16
86
12£213.22Doulton—
87
12£273.33Waterdropfilter UK—
88
12£274.17Waterdropfilter UK—
89
12£278.32Waterdropfilter UK—
90
12£358.32Waterdropfilter UK—
91
12£432.50Waterdropfilter UK—
92
12£682.46Waterdropfilter UK—
93
12£1,166.47Waterdropfilter UK—
94
12£1,749.80Waterdropfilter 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.