
Questions, answered
How often should I change the cartridge?
Every 2–3 months for most homes — sooner if you're in a hard-water area or shower daily. The cartridge darkens as it works, so you can see when it's time.
How do I fit it?
Unscrew the handle, lift the old cartridge out, drop the new one in and screw it back together. It takes seconds and needs no tools.
Will it fit my Purl shower head?
Yes — these are the standard cartridges and fit every Purl shower head we sell.
Delivery and returns?
UK delivery is free on orders over £45 — the Twin Pack qualifies — and £3.99 below that. Every order is tracked. Not right for you? Return it within 30 days — see our returns policy for the details.