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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 1–100 of 106, ranked by our score.

#ProductOur ratingBest priceRetailersDimensions (cm)Features
1
71£20.83Waterdropfilter UK—3-stageundersinktwist-lockcarbon-filtrationkdf
2
70£24.95Doulton—filterswitchdual-filtration
3
70£27.49Waterdropfilter UK—undersinkcompacttool-free-installationrv-compatible
4
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
5
67£36.45Doulton—limescale-inhibitingceramic-exterioractivated-carbon-core
6
67£36.45Doulton—sediment-reduction5-micronduo-trio-compatible
7
66£39.95Doulton—filterinsulatedhandle
8
59£66.66Waterdropfilter UKW9.1 × L9.8 × H31.2dedicated-faucetundersinkno-electricityportablekdf-filter
9
59£66.66Waterdropfilter UK—direct-connectunder-sinkno-drilling-requiredstainless-steel
10
58£33.33Waterdropfilter UKW8.4 × L8.4 × H26.9twist-incarbon-block
11
58£70.83Waterdropfilter UKW9.144 × L9.779 × H31.242undersinkdedicated-faucetcompact
12
56£41.66Waterdropfilter UKW8.4 × L26.9filterultrafiltration
13
54£48.95Doulton—sight-gaugefloating-indicator
14
54£49.95Doulton—insulatedcarry-handle
15
52£16.95Doulton—switch
16
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
17
51£21.66Waterdropfilter UK—lead-free
18
51£23.95Doulton—canopy
19
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
20
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
21
50£25.95Doulton—canopy
22
50£64.16Waterdropfilter UK—reverse-osmosis5-stage-filtration
23
48£33.33Waterdropfilter UK—storage
24
48£108.33Waterdropfilter UK—3-stageunder-sinkdirect-connectcarbon-filtrationkdftwist-locktool-free
25
47£36.45Doulton—canopy
26
42£2.95Doulton—
27
42£2.95Doulton—
28
42£6.95Doulton—
29
42£9.95Doulton—
30
42£158.32Waterdropfilter UK—remineralizationreverse-osmosiswater-tank
31
42£190.83Waterdropfilter UK—hot-coldfiltrationsmart-indicatorscustomizable-settingsultra-capacity
32
Waterdrop G5P500 Reverse Osmosis Water Filtration System
Remove 99% Of Lead - Cleaner, Safer, Better
42£199.99Waterdropfilter UKW21.41 × L46.51 × H47.8tanklesssmart-controlreverse-osmosis7-stage-filtration
33
42£249.99Waterdropfilter UKW44.02 × L15.01 × H35.51tankless7-stage-filtrationmechanical-faucet
34
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
35
42£291.66Waterdropfilter UKW21.41 × L46.51 × H47.8tanklessalkaline-mineralizationsmart-faucetleak-free8-stage-filtration
36
42£296.95Doulton—gravityno-plumbingshower-filter
37
42£374.17Waterdropfilter UKW40.4 × L20.8 × H39.9hot-coldreverse-osmosistouch-screenportablechild-locksmart-control5-stage-filtration
38
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
39
42£499.99Waterdropfilter UKW46.5 × L19.8 × H43.4hot-coldfiltrationuv-sterilizationsmart-displaychild-lockcountertop
40
42£529.15Waterdropfilter UKW46.5 × L19.8 × H43.4hot-coldfiltrationuv-sterilizationsmart-displaychild-lock
41
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
42
42£1,082.50Waterdropfilter UKW15.9 × L46.2 × H42.5alkaline-mineralizationuv-sterilizationsmart-faucettanklesstds-monitorfilter-life-reminder
43
42£1,249.95Doulton—gravitywooden-standstainless-steel-taplimited-edition2-filters-included
44
42£19.95Doulton—
45
41£20.83Waterdropfilter UK—
46
40£24.99Waterdropfilter UK—
47
40£24.99Waterdropfilter UK—
48
40£24.99Waterdropfilter UKW10.8 × L10.8 × H42.7
49
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
50
40£25.95Doulton—
51
40£27.49Waterdropfilter UK—
52
39£29.16Waterdropfilter UK—
53
39£29.16Waterdropfilter UK—
54
39£29.45Doulton—
55
39£66.66Waterdropfilter UKW9.14 × L9.78 × H42.42under-sink
56
39£29.95Doulton—
57
39£29.95Doulton—
58
39£30Waterdropfilter UK—
59
38£33.33Waterdropfilter UK—
60
38£34.95Doulton—
61
37£36.45Doulton—
62
37£36.45Doulton—
63
37£36.45Doulton—
64
37£36.45Doulton—
65
36£41.66Waterdropfilter UK—
66
36£116.66Waterdropfilter UKW10.998 × L10.998 × H37.998reverse-osmosiswater-saving
67
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
68
35£43.95Doulton—
69
34£49.99Waterdropfilter UK—
70
32£91.66Waterdropfilter UKW10.9 × L10.9 × H38.1reverse-osmosis
71
32£149.99Waterdropfilter UKW15 × L15 × H43.3under-sinkeasy-maintenance
72
32£331.67Waterdropfilter UK—instant-hot-waterreverse-osmosis
73
32£57.50Waterdropfilter UK—
74
31£58.33Waterdropfilter UK—
75
31£58.33Waterdropfilter UK—
76
31£58.33Waterdropfilter UK—
77
31£58.33Waterdropfilter UK—
78
31£58.33Waterdropfilter UK—
79
30£100Waterdropfilter UK—bpa-free
80
28£71.65Waterdropfilter UK—
81
Waterdrop G3P600/G3 RO System Replacement Filters Set - 1-YEAR COMBO
Replacement For Wd-g3p600 Reverse Osmosis Water Filter System
27£74.15Waterdropfilter UK—
82
27£74.17Waterdropfilter UK—
83
27£74.99Waterdropfilter UK—
84
27£112.50Waterdropfilter UK—canopy
85
25£83.33Waterdropfilter UK—
86
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
87
23£124.95Doulton—gravity-fed
88
22£486.65Waterdropfilter UK—mineral-filter
89
20£99.99Waterdropfilter UK—
90
20£99.99Waterdropfilter UK—
91
18£108.33Waterdropfilter UKW42.4 × L16 × H16
92
12£133.32Waterdropfilter UKW15 × L15 × H43.3
93
12£166.66Waterdropfilter UK—
94
12£166.95DoultonW19.4 × L19.4 × H47.3
95
12£174.98Waterdropfilter UKW16 × L42.4 × H16
96
12£232.85Doulton—
97
12£255.85Doulton—
98
12£273.33Waterdropfilter UK—
99
12£274.17Waterdropfilter UK—
100
12£278.32Waterdropfilter 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.