5 Things to Know About Backwashing Your Pool Filter

Backwash based on pressure, not a schedule Wait until the pressure gauge reads 8–10 psi higher than it did right after a clean filter. That is the only reliable signal.

Ignore the calendar Backwashing by date wastes water and time if done too often, or lets the filter clog and stress the pump if done too rarely.

Watch for other signs too Slower return flow, a different pump sound, or weak skimmer action can also indicate it is time to backwash, but the gauge is clearest.

Frequency varies by pool Debris load, usage, and weather determine how often you need to backwash. It could be every few days in leaf season or every couple of weeks otherwise.

Check the gauge weekly Inspect the pressure gauge after heavy use or a storm. Trust the gauge, not the calendar.