How often should you change your water filter?
The short answer for RO, under-sink, pitcher, fridge and whole house filters, and the signs it is time.
Use the change interval on your filter's product page or in your manual. As a rough guide: fridge filters about every 6 months, pitcher filters about every 2 months, and RO membranes every 2 to 3 years.
Change sooner if water flow slows or your filter light comes on.
Why the interval matters
Every filter is built to handle a set amount of water. That amount is its rated capacity, often listed in gallons. Waterdrop lists it on the product page when it states one.
A certification, when a filter has one, is tested up to that capacity. Past it, the filter is working beyond what it was tested for. A time interval, like 6 months, is a simple way to stay inside that limit for a typical home.
Signs it is time
- 01The interval has passed. Check the product page or your manual.
- 02The filter light is on. Many fridges and RO systems track time or water used.
- 03Water comes out slowly. A full filter can slow the flow.
- 04Taste or smell changed. Note it, and check when you last changed the filter.
Typical intervals by filter type
Rough guidance for a typical home. The interval on your product page and in your manual always wins.
| Filter type | Typical change interval |
|---|---|
| Refrigerator | About every 6 months |
| Pitcher or dispenser | About every 2 months |
| Faucet mount | About every 3 months |
| Under-sink cartridge | Every 6 to 12 months |
| RO pre and post filters | Every 6 to 12 months |
| RO membrane | Every 2 to 3 years |
| Whole house sediment | Every 3 to 6 months |
| Inline or ice maker | About every 6 months |
Where to find your interval
On our product pages, look for "Change about every" in the specs. It comes from Waterdrop's own product page. If Waterdrop does not state one, we leave it out and you can follow your system or fridge manual.