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Thread: Sand filter putting lots of sand back into the pool

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    Join Date
    Sep 2015

    Sand filter putting lots of sand back into the pool

    My wife and i recently bought our first home and it had a wonderfull above ground pool with a sand filter. The other day I was sweeping the bottom of the pool and I left it on backwash while doing this seeing how I figgured the filter needed a cleaning as well. when I started the filter back up it was putting larg amounts of sand back into the pool. If i had to measure It I would say at least a cup every 5 min of sand. I'm thinking I broke something. What should I do?

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Sand filter putting lots of sand back into the pool

    Welcome to the forum.

    It is possible to damage the laterals with backwashing too much. The pressure and flow applied to the screens can cause them to split.

    I think you are at a point where you need to remove the sand and then the laterals to inspect them for tears.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Sand filter putting lots of sand back into the pool


    Did you Rinse after the backwash? That's only possible if you have a multiport valve; if you have a simple push-pull you don't have that option.

    Odds are, the extended backwash really churned up the sand and left a lot on the plumbing. Then on filter, it blew it into the pool. The rinse cycle would have gotten that stuff into the waste line not the return.

    Just vacuum it up. You can easily tell if more is getting spit out into the pool by attaching and old sock to the returns with a rubber band. If there's no sand in the sock, it's done spitting it out.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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