6 Steps to Backwash a DE Pool Filter When Pressure Rises 10 PSI

Backwash only when the pressure gauge reads 10 psi above your clean baseline. Do not backwash on a schedule or when the water looks cloudy. The pressure reading is the only reliable indicator.

Turn off the pump before moving the multiport valve. This prevents damage to the valve and filter grids.

Slide the valve to BACKWASH, turn the pump back on, and let it run until the sight glass runs clear. This usually takes 1-2 minutes.

Turn off the pump, move the valve to RINSE, run for 30 seconds, then turn off again. Rinsing settles the grids and prevents DE from bypassing them.

Set the valve to FILTER, turn the pump on, and add fresh DE through the skimmer. Add the amount printed on the filter label — usually 1-2 lbs for a new charge, then about 80% of that after each backwash.

Do not over-backwash. Doing it too often wastes DE and water. Under-backwashing makes the filter work harder and can blow dirty water back into the pool.