Filter Change Log

Filter Change Log keeps replacement dates and maintenance evidence in one place.

Use it to:
- Register filters and replacement cycles
- See upcoming, overdue, and completed work
- Keep notes and replacement history
- Search records and prepare a maintenance packet
- Use the app in English or Korean

Start with up to three filter records. A one-time Google Play purchase unlocks unlimited records. The purchase does not include subscriptions or external service credits.

Your records stay on your device unless a feature clearly says otherwise.