The Doughboy pool pump needs to be backwashed when the pound-per-square inch (PSI) rises over seven PSI above the clean reading, which is 10 PSI or lower. The filter captures the dirt particles that are filtered through the sand when the filtration system runs. After a time, the dirt in the sand will raise the PSI reading as the filtration system starts losing pressure. You must backwash a Doughboy pool pump at this time to keep the filtration system working properly to keep the pool water clean.
Turn off the pool pump. Remove the gasket and drain cap that is on the left side of the pump cover. Unroll the backwash hose, which is attached to the waste port on the bottom of the pump.
Turn the valve handle to the "Backwash" position. Turn the pump on and allow the pump to run for two to three minutes.
Turn the pool pump off. Turn the handle to the "Filter to Waste" position. Turn on the pool pump and allow the pump to run for 20 seconds.
Turn off the pool pump. Repeat Steps 2-3 one more time.
Turn off the pool pump and turn the valve to the "Backwash" position. Turn on the pump and run until you see clear waste water.
Turn off the pump. Check the water level in the pool. The water should be between the markers on the skimmer face plate. Turn the valve to "Filter to Waste." Remove the skimmer lid.
Turn on the pool pump. Add 2 1/2 pounds of diatomaceous earth (D.E.) to the skimmer. Use a coffee can, which holds 1/2 pound. Allow the pump to run for 30 seconds while adding the D.E.
Turn off the pool pump. Replace the drain cap and the gasket. Turn the valve to "Filter." Replace the skimmer lid. Turn the pool pump on.