In stock · ships freeClarisink Carbon Block Under-Sink Filter
£99.00
VAT included · Free UK delivery · Typically arrives in 4–21 business days
- Tracked delivery on every order
- 60-Minute Simple DIY Setup
- 2-Year Comprehensive Warranty
- Engineered for Hard UK Tap Water
Secure encrypted checkout · Visa, Mastercard, Amex
- Free UK delivery on every order, no minimum spend
- 2-year warranty on all filtration systems
- 30-day returns if it isn't right for your kitchen
- Fits a standard UK cold feed — no plumber required
- Secure, encrypted card checkout
Best under sink water filter UK families can rely on
Finding the best under sink water filter uk families can rely on is essential if you want to eliminate cloudiness, chemical odours, and heavy limescale from your daily kitchen tap water.
About this product
This is the simplest thing we sell that makes a real difference. One cartridge, no tank, no pump, no drain line, no electricity — water goes in one side and comes out the other tasting considerably better.
A dense carbon block works by adsorption: chlorine, chloramine and organic compounds bind to the enormous internal surface area of the carbon as water passes through. That is the entire mechanism, and it is why carbon is so good at taste and odour and so useless at dissolved minerals, which pass straight through.
Worth being honest about that boundary, because it is where most of the confusion in this category lives. If your complaint is that your water tastes of swimming pool, carbon fixes it for a fraction of the price of RO. If your complaint is limescale or a high TDS reading, carbon is not the answer.
Installation is genuinely a ten-minute job on standard 15mm pipework with push-fit connections.
Tracked delivery in 4-21 business days depending on the item. That is slower than a next-day marketplace and we would rather say so up front than surprise you at the door.
Technical specifications
- Connection size
- Standard UK 15mm push-fit / compression
- Micron rating
- 5 micron
- Lifespan
- Cartridge replacement intervals vary by stage — follow the schedule in your user manual
Litres and centimetres are used throughout. Cartridge life is measured in litres of filtered water, so heavily used households will change theirs sooner.
What scale reduction does and does not do
A point-of-use scale filter treats the water drawn from one outlet, which is the water that ends up in your kettle, coffee machine and cooking pans. It is not a whole-house softener and will not change how your shower feels or how much detergent your washing machine needs. For most households that trade-off is the right one: the appliances that suffer most from scale are the ones fed by the kitchen tap, and treating only those keeps the cost and the installation work proportionate.
The chemistry differs from a salt-based softener too. Rather than exchanging calcium and magnesium for sodium, a scale-reduction media conditions the hardness minerals so they stay in suspension instead of crystallising onto hot surfaces. Nothing is added to the water, no drain connection is required, no electricity is used, and the mineral content that gives British tap water its character is retained. That makes it suitable for rented properties where notifiable plumbing work is not an option.
Expect the improvement to show up gradually. Existing scale inside a kettle will not disappear on its own — descale once after fitting, and from then on the deposit builds far more slowly. Glassware spotting and the film on the surface of tea usually improve within days, because those come from freshly drawn water rather than accumulated deposit.
Specifications
| Filtration stages | 1 (carbon block with scale inhibitor) |
|---|---|
| Filtration rating | 5 micron |
| Flow rate | approx. 3.8 litres per minute |
| Cartridge capacity | approx. 4,000 litres |
| Cartridge life | approx. 6 months |
| Housing size | Standard 10-inch |
| Power required | No |
| Waste water | None |
| Connections | Push-fit |
| Under-sink footprint | approx. 12cm W x 33cm H x 12cm D |
Figures marked with this symbol are provisional and are being confirmed against the manufacturer's datasheet. We publish them as estimates rather than leaving the row blank, and we do not claim any certification or test result we cannot evidence.
What this filter addresses
- Chlorine and chloramine
- Volatile organic compounds
- Sediment and particulates
- Some scale-forming behaviour in moderately hard water
What it will not do
- Carbon does not remove dissolved solids. If your goal is a lower TDS reading, this will not deliver it — reverse osmosis will.
- It does not remove fluoride or nitrates.
- Scale inhibition here is lighter than the Limescale Defender's dedicated polyphosphate stage. In a very hard-water area, choose the Defender.
- Six-month cartridge life is shorter than the Defender's twelve, so factor the running cost in.
Will this fit?
Check these before you order — they are the questions we are asked most often.
- Standard 10-inch cartridge housing
- Takes replacement cartridge CS-CBC1
- Push-fit connections suit standard UK 15mm under-sink pipework
Still not sure? Send us your sink and pipework details and we will confirm before you buy.
Customer reviews
Verified reviews from Clarisink customers in the UK. Every review is read by a person before it appears.
No reviews yet
Clarisink is a new shop. We never buy or fake reviews. When our customers write in, their unedited words appear here.
Bought the Clarisink Carbon Block Under-Sink Filter? We'd genuinely like to hear how you got on with it.