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Thread: Sand in pool after backwashing

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    cliffstone's Avatar
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    Sep 2009
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    Sand in pool after backwashing

    I recently bought a home with a baqucil pool and after converting to chlorine
    changed the sand in the filter. Since then when I rinse after backwashing, there
    is sand in the sight glass. Also when I initially switch to filter (after backwashing)
    there is sand coming out the returns for about 20-30 seconds. Yesterday was the third
    time this occurred. When I changed the sand there was no damage to the laterals
    and the pipe in the middle looked OK. I filled the filter tank about 1/3 full with water
    before adding sand to cushion the laterals. Is this normal after changing sand for a
    period of time or do I have problems? Any advice would be greatly appreciated.
    18x36 IG, 22k Gal, Vinyl, 1HP Hayward SuperPump, 250lb Hayward Sand Filter

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    duraleigh's Avatar
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    Re: Sand in pool after backwashing

    Welcome to the forum.

    Are you using the "rinse" position in between "backwash" and "filter" until the sight glass clears?

    How much sand did you put in?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    cliffstone's Avatar
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    Re: Sand in pool after backwashing

    I rinse for about 30 seconds and it is clear except for
    the sand in the sight glass. Should I rinse longer? I added
    250 lbs of sand which is listed on the filter tank.
    18x36 IG, 22k Gal, Vinyl, 1HP Hayward SuperPump, 250lb Hayward Sand Filter

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    dmanb2b's Avatar
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    Re: Sand in pool after backwashing

    you should rinse for about 2 minutes or until there is no sand in the sight glass, before switching back to filter.

    Also...very important, be sure to turn off your filter each time before you change positions on the multiport valve.

    ie.. turn off filter, set to backwash--turn on the filter (wait for clear water to come out the backwash hose)---turn off filter---set valve to rinse---turn on filter---run 2mins or until sight glass is clear---turn off filter----set valve to filter---turn on filter.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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