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How to backwash a swimmimg pool sand filter


  • Turn pool pump off
  • Turn multiport valve to backwash
  • Make sure to open backwash gate valve if you have one
  • Turn pump back on and run it for approximately 2 minutes or until sight glass is clear
  • Turn pool pump off.
  • Turn multiport to rinse
  • Turn pump on and run about 1/2 to 1 minute
  • Turn pump back off
  • Turn multiport valve to filter
  • Close backwash gate valve if you have one
  • Check pool water level, add more water if needed
  • Start pump for normal filtering 

We recommend backwasing your filter weekly or once the pressure increases 8-10 PSI.



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  1. JD says:

    This is really helpful for pool owners. Do you have any tips for the other types of swimming pool filters like DE pool filters?

  2. SwimmingPools says:

    This is a nice blog site. What would you recommend as the best way to keep the pool algae free?

  3. Scott says:

    To keep the pool algae free you should make sure the pH is 7.4-7.6. If the pH is off the chlorine will not be as effective. Maintain a 1.0-3.0 ppm level of the proper sanitizer. If you have reoccurring algae use copper algaecide. If you use copper algaecide make sure your chlorine level is not too high to prevent staining.

  4. Excellent tips on backwash a swimmimg pool sand filters. Thanks a lot.

  5. Karin says:

    Should people be OUT of the pool when an operator backwashes a pool?

  6. Catherine Team says:

    My pool turned a nice emerald green because I have overhanging trees above pool. I bought something called Kleen Pool and within three days it was clear. My pool guy had said to drain it since I have a sand filter, but I bought this Kleen Pool stuff and it worked. Whew!

  7. Johnny says:

    Karin, backwashing the pool with swimmers is fine. It’s just like running the pump with people swimming.

  8. REPLICA HANDBAGS view says:

    What interesting


  9. Wonderful post. Indeed I do explore the blogging world to find the latest on swimming pool industry, their designs and construction and I came across your blog post and found it is indeed noteworthy. I am now your regular subscriber and do wish you will be posting more good posts on swimming pools over the coming days. Thanks

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