3 Things to Know About When to Backwash a DE Filter

Backwash based on the pressure gauge, not a calendar The gauge is more reliable than a set schedule. Backwash when it reads 8–10 PSI above the clean starting pressure, which varies with bather load and debris.

Backwashing too early or too late causes problems Backwashing too early wastes DE and water. Backwashing too late strains the pump and reduces filtration quality.

Mark the gauge to make it easy Use a Sharpie to mark 10 PSI above your clean pressure on the gauge face. When the needle hits that line, backwash; otherwise, leave it alone.