A water filter replacement log: remember when you last changed it
“When did I last change the water filter?” is easier to answer if the date lives somewhere other than the empty cartridge box. Keep a water filter replacement log with the installation date and the exact filter you used. That way, you can check both how long it has been and which replacement to order.
Last Time keeps a separate counter and history for each event on your iPhone or iPad. A note can hold the cartridge details without making the event name hard to scan.
Give each filter its own record
Use names such as “Replace kitchen pitcher filter” and “Replace fridge water filter”. If you track both under one “Water filter” event, changing the pitcher would also reset the date you were using for the fridge.
For a system with several cartridges, use one event if you always replace them together. Use separate events when the cartridges have different replacement schedules.
A water filter log template
The following is an example record, with placeholders to fill from your packaging or manual:
| Field | What to record |
|---|---|
| Event | Replace kitchen pitcher filter |
| Completed date | The day the new cartridge was installed |
| Filter | Brand, product name and cartridge model |
| Replacement guidance | The stated time or capacity limit for this filter |
| Indicator | Whether the filter indicator was reset |
| Next purchase | Pack size, shop or product reference |
Use the installation date rather than the order date. If a cartridge sat in a cupboard for a month, the purchase receipt does not tell you when you started using it.
Time and water use can both matter
Filter schedules are specific to the cartridge. For example, Brita’s replacement filter guidance lists 40 gallons, or about two months, for its Original filter and 120 gallons, or about six months, for its Elite filter. Brita also notes that hard water may require more frequent replacement.
Those are examples for those products. Read the guidance for your own filter and keep using its built-in indicator where supplied. An elapsed-time counter records the date; it does not measure how much water has passed through a cartridge.
Record a change in Last Time
- Add an event for the specific filter.
- Set the date to the day you installed it. If you know an earlier date from a record, you can backdate it.
- Put the cartridge model and manufacturer’s replacement guidance in a note.
- Mark the event done when you install the next cartridge, so the previous changes remain in its history.
If you cannot establish the last installation date, start the log with the next replacement instead of guessing a precise date. Keep a new cartridge type in that entry’s note so you can tell which filter each past date refers to.
Keep the other appliance dates nearby
A Home folder can hold the filter log alongside coffee machine descaling and other home maintenance records. Each still has its own date and history, so a quick glance can answer the question for the right appliance.