Guide
Filter replacement tracker: replace it when it is due, not when you happen to remember.
Track the latest real filter replacement so HVAC, water, air-purifier, and other household filters are not changed unnecessarily early or left too long.
The important date is the last real replacement
Filters are usually out of sight and replaced weeks or months apart. That makes them a classic “I think we changed it recently” household problem.
Knowing the latest real completion gives the household a factual starting point before deciding whether replacement is due again.
Replace water filter
The real replacement is 95 days old against a 90-day expected interval, so the task can surface as needing attention.
Use a separate task for each filter that matters
HVAC or ventilation filters, water filters, air-purifier filters, and aquarium filters can each keep their own Last Done history and cadence.
This avoids one generic reminder that loses track of which filter was actually replaced and when.
Related maintenance
For coffee machines, washers, dishwashers, and other appliance care, see the appliance maintenance tracker.
Related: all Done When use cases, all Done When guides, features, and FAQ.
Keep shared tasks clear without over-managing them.
Try Done When free, or explore the interactive demo on the home page before creating an account.