Whole House 3+1

Full-home filtration designed for the average British four-bedroom house with a single mains feed. Three primary stages strip the heavy contaminants; a fourth stage polishes the result.

£599·00

Filter housings

Request a postcode survey Call Mark · 07377 942552

Coverage4-bed home · single mains
Stage 1Sediment & kidney care
Stage 2Chlorine & by-product removal
Stage 3Multi-media & PFAS protection
Stage 4Bacteria & microplastic finish
CertificationNSF / EU equivalent · 42 · 53 · 401
Filter housingsPotable plastic (stainless option)
Servicing£199 annual swap-out
WarrantyLifetime, on the housing

Inside the system

Why four stages, and not one bigger filter?

Each stage carries a job no other stage can do as well. Combine them and the system can address every contaminant class — including the ones regulators haven't named yet.

Sediment & kidney care

5-micron sediment + lead-and-heavy-metal pre-filter. Removes the load your kidneys would otherwise be processing.

Chlorine & by-products

Catalytic carbon block targeting chlorine, chloramine, THMs and HAA5 disinfection by-products.

Multi-media & PFAS

Layered media including KDF and ion-exchange resin for PFAS, fluoride modulation and pharmaceutical residues.

Bacteria & microplastics

Sub-micron polish stage targeting bacteria, pathogens and microplastics down to 0.2 µm. Tested at 99.999%.

vs. The Bottle

The maths against supermarket bottled water.

A typical UK household drinks the equivalent of around 1,400 litres of bottled water per year. Here is what that looks like, side by side.

Per year

Bottled

Watermark 3+1

Cost (1,400 L)

£980+

£199 service

Plastic bottles

~2,800

Microplastic ingestion

High

Filtered out

CO₂e (production + transport)

~190 kg

~12 kg

Ready to install

Send your postcode.
We'll do the rest.

Every install begins with a free postcode profile. We'll come back with a tailored recommendation, an installation window, and a fixed quote. No pressure, no upsell.