Do whole house filters reduce water pressure?

Quality whole house filters are designed to maintain flow rates of 15-56 L/min, which is enough for most UK homes. Pressure drops are minimal with properly sized systems.

Can I install a whole house filter myself?

Whole house filters are installed at the mains inlet and require professional plumbing. This is not a DIY job unless you are a qualified plumber.

Whole House Filters

Installed at the mains inlet, these systems filter every drop of water entering your home.

Best for: Homeowners wanting filtered water from every tap and shower · £250–£499

Read our full guide: Best Whole House Water Filter UK

Not sure which to pick? Check your water first.

Try your postcode — e.g. SW1A, M1, B1

BWT E1 Single Lever

Whole House · WRAS approved

Why it fits: WRAS approved — meets UK plumbing standards
Single-lever backwash makes maintenance straightforward
Protects boilers and appliances from sediment damage
What it won't do: Only removes sediment and particles — not heavy metals or PFAS

Typical price

£250approx.

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Osmio PRO-III Ultimate Whole House

Whole House · NSF/ANSI 42, NSF/ANSI 61, WaterMark

Why it fits: The only whole-house unit here that also targets bacteria, nitrates and pharmaceutical residues
NSF/ANSI 42 and 61 certified via IAPMO, with WaterMark approval as well
Ceramic stage runs three years, so most years need only a carbon change
What it won't do: Does not touch limescale, so hard-water homes still need a separate softener

Typical price

£499approx.

Check current price at Osmio

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Side-by-side comparison

Filter	Price	Rating	Sediment	Chlorine	Particles	Lead	Bacteria	Nitrates	Heavy metals	Hormones	Annual Cost
BWT E1 Single Lever (opens in new tab) Protecting whole-house plumbing from sediment and particles	£250	4.3									—
Osmio PRO-III Ultimate Whole House (opens in new tab) Whole-house treatment where bacteria and heavy metals matter more than limescale	£499	4.4									£188/yr

Common questions

Do whole house filters reduce water pressure?: Quality whole house filters are designed to maintain flow rates of 15-56 L/min, which is enough for most UK homes. Pressure drops are minimal with properly sized systems.
Can I install a whole house filter myself?: Whole house filters are installed at the mains inlet and require professional plumbing. This is not a DIY job unless you are a qualified plumber.

We may earn a commission when you buy through our links, at no extra cost to you. Recommendations are based on water quality data, not sponsorship. Affiliate disclosure