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Thread: Sand from filter.....?

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    Join Date
    May 2011
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    State College,PA
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    Sand from filter.....?

    My wife noticed the bottom of the pool had more dirt/sand in it. She cleaned it Wednesday or Thursday. We left town for a night and kept the filter off and came back today to find the dirt. Not all over the place but still very noticeable. So here's my question: Could this be sand coming from the filter? We changed the sand in the filter this year. All of the fingers in the bottom of the filter looked good. We did end up blowing some sand into the pool on start up but rerouted the input hose until it turned clear. Just wondering if we could have something wrong with the filter or need a heavier grain of sand? Used the recommended type of sand listed on the filter. (#20 Silica)
    15x30 AG, 13000 gal
    Sand Filter 22", 1.5hp, Flow/backwash rate 55 gpm

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand from filter.....?

    Most likely it's just blown in dirt. You can put a stocking or sock over a return for a little while and if it's sand from the filter the sock will catch some of it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    JesseWV's Avatar
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    Apr 2011
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    Re: Sand from filter.....?

    The sand in the filter is very coarse. Most pieces are almost 1mm2. This is way bigger than most sand you'd find in your yard or in sandbox type sand. They are probably so relatively large so they don't get churned out of the filter when backwashing.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    May 2011
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    State College,PA
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    Re: Sand from filter.....?

    Thanks!
    15x30 AG, 13000 gal
    Sand Filter 22", 1.5hp, Flow/backwash rate 55 gpm

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Sand from filter.....?

    We left town for a night and kept the filter off and came back today to find the dirt. Not all over the place but still very noticeable. So here's my question: Could this be sand coming from the filter?
    Not with the pump not running. Have you retrieved any of it from the bottom to make sure it is gritty sand and not slippery dead algae.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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