How do I backwash my sand filter?

How do I backwash my sand filter?

Step-by-step instructions on how to backwash a sand filter

If I had a nickel for every time I was standing in front of a pump pad, needing to backwash, wishing I had step-by-step instructions on how to backwash, I would have at least enough for one of those plastic rings out of a gumball machine! I figured it is about time I whipped up a list of instructions!

Backwashing reverses the flow through your filter which will flush out the dirt and debris. When the pressure gauge is reading 6 – 8 lbs above the starting pressure it is time to backwash the filter.

To backwash a sand filter with a multiport valve:

  • Step 1:
    Shut off pump motor
  • Step 2:
    Shut the skimmer and main drain valve by placing the valve handle perpendicular to the pipe
  • Step 3:
    Rotate the multiport valve from FILTER to BACKWASH position
  • Step 4:
    Open the suction valves by turning the handle parallel to the pipe
  • Step 5:
    Turn the pump on
  • Step 6:
    Run for 3 – 5 minutes or until water runs clear in the sight glass
  • Step 7:
    Shut off pump motor and move multiport valve handle to RINSE position. Run on rinse for 15 – 30 seconds
  • Step 8:
    Shut off pump motor
  • Step 9:
    Shut the skimmer and main drain valves by placing the valve handles perpendicular to the pipe
  • Step 10:
    Remove the lid of the pump and clean out the pump basket, put the pump basket back into the pump and secure the pump lid
“It is also important to check the pump basket daily.”
  • Step 11:
    Move the multi-port valve to filter position
  • Step 12:
    Open the pressure relief valve on the top of the filter
  • Step 13:
    Open the skimmer and main drain valves
  • Step 14:
    Turn pump back on and note lower filter pressure. If no pressure difference is observed it may be time for a new pressure gauge or time to consider changing your filter media
  • Step 15:
    Note the water level in the pool and fill if necessary. Water is evacuated from the pool so you will need to refill your pool to the appropriate level.

It is also important to check the pump basket daily. If there are leaves or other debris, shut off the pump, close your skimmer and main drain valves and empty the basket. When completed, re-insert basket, close pump lid, open valves and turn the pump back on. A clogged pump basket will hinder the pump performance leading to unbalanced chemicals and it could shorten the life of your pump.

If you have additional questions just give us a shout out here and we will be happy to help!