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Tandy Jerome
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Pool Newbie
Asked: 2021-04-05T00:52:00-07:00 In:

How do I know if my sand filter is clogged?

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How can you tell if you have a clog in your sand filter? How often should you backwash it?

clogcloggedpool filtersand filter
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2 Answers

  1. Best Answer
    Pool Newbie Pool Professional
    1. Turn off the pump.
    2. Close the suction and return line valves.
    3. Remove the pump’s cover and empty the filter basket.
    4. Replace the cover.
    5. Turn on the drain outlet valve.
    6. Switch the lever to the BACKWASH position.
    7. Open the suction and return line valves.
    8. Turn on the pump. Rinse the filter for 1–2 minutes, or until the water in the sight glass is clear. NOTE: All electric heaters must be turned off.
    9. Turn off the pump.
    10. Turn the lever to the RINSE position, start the pump, and rinse for 15-30 seconds.
    11. Stop the pump and move the lever to the FILTER position. This is the standard working position.
    12. Start the pump after closing the drain outlet valve. If you have an electric heater, turn it on.
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  2. Pool Expert

    If your sand filter is clogged up, your backwashing cycles will get shorter and shorter and shorter. Check to see if the sand filter looks dirty or greasy. If it looks like sandy lard, water is definitely going to stop flowing through it. Backwashing the sand filter isn’t really based on time but on pressure. Backwash the filter once the pressure gets to be 8-10 psi over the starting level. If any of this is over your head, contacting a pool repair specialist who provides this type of service is probably your best bet.

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