How to change a water filter cartridge

When to change

• Per manufacturer interval (often months, not years) — see the card.
• If pressure has dropped and aerators are clean.
• If the element looks brown/black.

Steps

1. Shut off water before the filter; open the nearest tap to relieve pressure.
2. Hold a bucket — there will be water in the housing.
3. Unscrew the bowl with the key (often included).
4. Remove the old element; wash the bowl (no aggressive chemicals if the manufacturer forbids them).
5. Check the O-ring — if dry/cracked, replace it.
6. Insert the new element in the correct direction (arrow/label).
7. Tighten the bowl; open water slowly; check for leaks.
8. Run water 1–2 minutes to flush carbon dust / fibres (if the type requires it).

Element examples

Safety