3 Things to Know About Backwashing a DE Filter

Backwash based on pressure, not a schedule Most DE filters run clean at 10–15 psi. When the gauge rises 8–10 psi above that, it is time to backwash.

Backwashing by calendar wastes DE and water If you backwash on a fixed schedule, you will either backwash too early or too late. Early backwashing wastes diatomaceous earth and water.

Waiting too long strains the pump Letting the filter get clogged forces the pump to work harder, which can damage it over time.