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Home > School Of Pool > How Do I Back Wash My De Filter?
Backwash your filter when the pressure reaches 10psi over the “clean reading” to obtain the best filtering capabilities. If your pool is dirty, green or cloudy, back washing may be a frequent task. This is because the filter is doing its job of pulling out the problem causing contaminants. Every pool is different. Here are some general instructions that may help refresh your memory.

Overview for Back washing a DE Filter with a multi-port valve:
  • Turn off pump and empty & clean the pump basket. Reassemble the pump.
  • Turn filter handle to backwash position.
  • Turn pump back on. Water will start to come out the backwash line.
  • Backwash for at least 3 minutes.
  • When the water runs clear in the sight glass, turn the pump off and turn the handle to rinse. Turn the pump back on for 15-30 seconds.
  • Turn the pump off and turn the handle to filter.
  • Turn the pump back on and bleed any remaining air from the tank.
  • Once water begins circulating through the system, add your DE to the skimmer to re-coat the filter grids.

Overview for Back washing a DE Filter with a push/pull valve:

  • Turn the off pump and empty & clean the pump basket. Reassemble the pump.
  • Twist the handle and pull up on the valve to move it into backwash position.
  • Turn pump back on. Water will start to come out the backwash line.
  • Backwash for at least 3 minutes.
  • When the backwash water runs clear, turn the pump off. Push the handle to the filter position and twist it to lock it in place.
  • Turn the pump back on and bleed any remaining air from the the filter tank.
  • Once water begins circulating through the system, slowly add your DE to the skimmer to re-coat the filter grids.