Filter replacement reminders
An exhausted filter doesn't announce itself - it just quietly stops reducing what you bought it to reduce. Pick your system and the date you last changed filters; we'll work out your next four change dates and build a calendar file you can import anywhere. Nothing is uploaded - the math happens in your browser.
Running costs and cartridge sources for every model live in the replacement hub.
Or get the nudge by email instead
Certification-first picks, price-drop alerts on the systems we track, and a nudge before your cartridge is due - about once a month. No spam, unsubscribe anytime.
Prefer not to share an email? The reminder tool gives you a calendar file instead - no signup at all.