3 Things to Know About When to Backwash a Pool Filter

Backwash based on pressure, not time Backwash when the pressure gauge reads 8-10 PSI higher than when the filter was clean. Ignore any schedule like “every 30 days.”

Frequency varies with use In heavy swimming season, you might need to backwash every 2-3 weeks, or every week with lots of debris. Low-use pools can go 4 weeks or more.

The gauge is the only reliable indicator Following a timer wastes water or lets the filter choke. Watch the pressure gauge, not the calendar.