Under sink water filter

Better-tasting water, straight from your tap

Filtr8 fits under your kitchen sink and filters your water before it reaches the glass. You fit it yourself, with no plumber and no drilling, and one cartridge lasts a year.

Kits from£68.98Was £89.99Free UK delivery and 30-day returns.

Literally took me 10 minutes to fitChloe Budd, verified buyer on Amazon UK

The Filtr8 under sink water filter
Choose your kit

Three kits. One filter.

Every kit fits under a standard UK sink with no plumber and no drilling. They differ in how many cartridges come in the box, and whether you want the three-way tap.

Save £21.01Starter Kit What's in the Starter Kit

Starter Kit

£68.98Was £89.99

The filter, one cartridge and everything you need to fit it. A full year of filtered water.

  • 1 x Under Sink Water Filter Head
  • 1 x Water Filter Cartridge
  • 2 x Flexible Hoses
  • Fixings & Fixtures
  • Installation Guide
Two years coveredSave £19.99Drink More Kit What's in the Drink More Kit

Drink More Kit

£98.98Separately £118.97

Comes with a second cartridge, so you're covered for two years.

  • 1 x Under Sink Water Filter Head
  • 2 x Water Filter Cartridges
  • 2 x Flexible Hoses
  • Fixings & Fixtures
  • Installation Guide
Includes the tapSave £69.98Professional Kit

Professional Kit

£198.98Separately £268.96

Two cartridges, plus a stainless steel 3-way tap for hot, cold and filtered water.

  • 1 x Three-Way Filter Tap
  • 1 x Under Sink Water Filter Head
  • 2 x Water Filter Cartridges
  • 2 x Flexible Hoses
  • Fixings & Fixtures
  • Installation Guide

After your kit, a new cartridge each year is £39.99 with Subscribe and Save, about £3.33 a month.

  • Free UK delivery
  • 30-day returns, no questions asked
  • No plumber, no drilling
How it works

Fitted in four steps

Everything you need comes in the box, and there's nothing to drill.

  1. Turn off the water

    Turn off the water

    Turn off the cold water supply under your sink.

  2. Connect to the cold pipe

    Connect to the cold pipe

    Attach the inlet hose from the box to your cold water supply.

  3. Connect the filter

    Connect the filter

    Connect both hoses to the filter head. Everything you need is in the box.

  4. Pour a glass

    Pour a glass

    Turn the water back on and pour your first glass of filtered water.

The Filtr8 filter fixed to the side wall of a kitchen sink cabinet
Will it fit?

Made for the space under your sink

The filter hangs on the side of the cabinet, so it stays out of the way and the cupboard floor stays clear.

Height
31.2cm
Width
9.9cm
  • Mounting hooks on the back of the filter head
  • Two flexible hoses in the box connect it to your cold water supply
  • No plumber and no drilling

Not sure it will fit? Send us a photo of your sink cupboard and we'll take a look.

Ask us
What it removes

Up to 99% of what you don't want in your glass

The carbon block in each cartridge, made from NSF/ANSI certified materials, catches these before your water reaches the glass. These are the reductions in Filtr8's own performance testing.

99.20% LeadCan get into water from older lead pipes, and there's no known safe level of it.
99.40% Free chlorineThe main cause of that swimming-pool taste and smell in tap water.
99.10% ChloramineA long-lasting disinfectant some water companies add instead of chlorine. It leaves a taste and smell of its own.
99.55% MicroplasticsTiny pieces of plastic from packaging, clothing and tyres.
99.16% MercuryA toxic metal that's harmful even in very small amounts.
99.20% VOCsChemicals from fuels, solvents and industry that can find their way into water. Several are linked to long-term health effects.

Figures from Filtr8's performance data sheet, F8-PDS-2026-V1. Results at your tap depend on your local water supply.

Carbon block cartridgeNSF/ANSI certified materials
Verified buyers

Easy to fit, and you can taste it

Read more reviews
Literally took me 10 minutes to fit, not bad for my first ever plumbing job. Water tastes way better even my 10 year old son noticed a difference.
Chloe Budd6 January 2026 Amazon UK, verified purchase
Great Product, installation was simple and straightforward, and the difference in water taste is noticeable - much fresher and cleaner. Really pleased and would definitely recommend.
Tom19 February 2026 Amazon UK, verified purchase
Fast Delivery. Easy to install, great quality, and the water tastes much better. Highly recommend.
Jude24 January 2026 Amazon UK, verified purchase
Questions

Good to know

Straight answers to the things people ask before they order.

Ask us anything
Do I need a plumber?

No. It fits under a standard UK sink using the hoses and fixings in the box, with no drilling.

Will it fit under my sink?

The filter unit is 31.2cm tall and 9.9cm wide, so it sits comfortably in most UK sink cabinets.

Which kit should I choose?

The Starter Kit if you're trying Filtr8 for the first time. The Drink More Kit if you'd like two years of cartridges in one go. The Professional Kit if you also want the three-way tap for hot, cold and filtered water.

How often do I change the cartridge?

Every 12 months. The old one twists out and the new one twists in, in about 30 seconds. Subscribe and Save sends a new cartridge every 12 months for 20% less, and you can cancel anytime.

Can I return it after fitting it?

Yes. If you don't like it, send it back within 30 days of delivery, used or not. Return postage is yours to pay unless the item arrived damaged.

When will my order arrive?

Delivery is free to UK addresses and sent Royal Mail Tracked 24. Orders usually arrive in 2 to 3 working days.

Ready when you are

Your tap, upgraded

Kits from£68.98Was £89.99

Free UK delivery, and 30 days to change your mind.