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Thread: Rinsing/cleaning sand in filter

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    Rinsing/cleaning sand in filter

    Let me share what I did this past weekend.

    My pool water was cloudy and I could see small bitts of matter (dead algae) suspended in there. The filter was not filtering well, I thought. I had backwashed it numerous times and nothing, still cloudy water. I have decided to pop the cap where the pressure gauge was and peek inside. The sand did not look that dirty. I have heard about water house and spraying inside method but decided to go one step further. I put the filter on backwash, moved the water supply pipe inside the filter to the side and turned the pump. Stuck my arm inside and started moving sand around. Yeah, water came over the top but you should have seen it. I could not believe how dirty it was. The pressurized water from underneath made sand really "liquid". I kept moving sand around until water that was overflowing was clean then I put everything together and put the filter on rinse and rinsed for about a minute.

    The filter has been running overnight and I already see the bottom. Major improvement.

    This will be my to do item at the beginning of swimming seasons.

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Rinsing/cleaning sand in filter

    I take it that you have a filter with a side mounted multiport valve!
    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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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Rinsing/cleaning sand in filter

    Welcome to tfp, wasilm

    Remembering your other thread, it sounds like you have completed the SLAM process? If not I would at least do a Overnight Chlorine loss test (OCLT) to ensure you are not still killing something off. See: Just because the filter is now filtering does not mean that organics have gone away in the pool
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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