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How to Backwash a Swimming Pool Filter

Backwashing a sand or DE pool filter is a simple process that helps to remove dirt, debris, and other contaminants that have accumulated in the filter. Here is a general guide on how to backwash a sand or DE pool filter:

  1. Turn off the pump: Before starting the backwash process, turn off the pump to prevent water from flowing through the filter.
  2. Set the valve to the “backwash” position: Most pool filter systems have a multiport valve that controls the flow of water through the filter. The valve will typically have a “backwash” position that diverts the water flow in the opposite direction, allowing it to flow backwards through the filter and out through a waste line.
  3. Turn on the pump: Once the valve is in the “backwash” position, turn the pump back on. This will start the flow of water backwards through the filter, pushing the dirt and debris out through the waste line.
  4. Run the backwash for 2-5 minutes: Allow the water to flow backwards through the filter for 2-5 minutes, or until the water coming out of the waste line is clear.
  5. Set the valve to the “rinse” position: Once the backwash is complete, set the valve to the “rinse” position. This allows fresh water to flow through the filter for a few seconds, cleaning out any remaining debris.
  6. Set the valve to the “filter” position: After the rinse, set the valve back to the “filter” position, allowing the water to flow normally through the filter.
  7. Turn the pump on and check the pressure gauge: Turn the pump back on and check the pressure gauge. If the pressure is back to normal, the filter is clean and ready to use.

Note that, in the case of DE filters, after backwashing, you will need to add new DE powder to the filter before turning the pump back on. You can do this by following the manufacturer’s instructions for adding DE powder to the filter.

It’s important to note that the frequency of back-washing depends on the usage of the pool and the water chemistry, and it is recommended to consult with a pool professional to determine the best schedule for back-washing your pool filter.