Practical tools

Water hardness converter and softener cost calculator

Use official water information and your own quotes. Results are estimates, not product recommendations.

Classify and convert water hardness

First find the current hardness value for your postcode from the water supplier. Then classify and convert it here.

PostcodeFind my official supplierHardness valueUnit

Enter the value shown on your supplier report.

Five-year cost calculator

Use written quotes and your own estimates. No savings are assumed.

Equipment price (£)Installation (£)Annual salt, water and servicing (£)Years

Enter the figures from a current quote.

Installation readiness checklist

Tick each item only after checking it with the manufacturer or installer.

Incoming mains location identified Cabinet and refill clearance measured Suitable drain and overflow route confirmed Bypass arrangement included Drinking-water arrangement agreed Pressure, flow and power checked

0 of 6 checks completed.

Treatment route prompt

Recurring scale across the home: investigate measured hardness and ion-exchange softening.

Taste or odour: diagnose the cause, then check relevant filter claims.

Sudden colour, smell or safety concern: contact the water supplier rather than buying treatment first.

Compare treatment routes