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Thread: Backwashing Frequency

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    TrevNJPool's Avatar
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    Backwashing Frequency

    Every time I vacuum on filter I have to backwash when I'm done. Is this normal? I have completely rebuilt the filter. New sand, multiport, laterals and shaft. Not sure if this is normal or not.

    - - - Updated - - -

    My normal pressure is around 12 and can jump up to over 20. It isnt a whole lot of gunk either. Mostly some sand and dirt. A few small pieces of leaves and some beatles and spiders. Maybe a small toad or two
    40x18 Lazy L Rectangle
    29500gal IG w/ vinyl liner
    HAYWARD S244T 300lb sand filter
    Hayward Super Pump 1 1/2hp

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    JasonLion's Avatar
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    Re: Backwashing Frequency

    Needing to backwash after vacuuming is common enough. You would be able to go longer between cleanings with a larger filter.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    TrevNJPool's Avatar
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    Re: Backwashing Frequency

    So I guess the 300lb hayward filter is too small for the pool?
    40x18 Lazy L Rectangle
    29500gal IG w/ vinyl liner
    HAYWARD S244T 300lb sand filter
    Hayward Super Pump 1 1/2hp

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    JasonLion's Avatar
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    Re: Backwashing Frequency

    There are different measures of what is "too small". Your filter is a little above the minimum size, but well below the ideal size. For a pool that size I would use a 600 lb sand filter.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    TrevNJPool's Avatar
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    Re: Backwashing Frequency

    Great, another thing the previous owner screwed up for me.
    40x18 Lazy L Rectangle
    29500gal IG w/ vinyl liner
    HAYWARD S244T 300lb sand filter
    Hayward Super Pump 1 1/2hp

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    Re: Backwashing Frequency

    When it comes to filter size, I say go with the biggest one you can afford. The biggest advantage is less frequent backwash/cleaning that you have to do.
    12000 Gallon IG Plaster built 2/15/2014. Jandy 340 sg ft 127 gpm filter, Jandy 1 HP stealth pump. Circupool RJ-45 SWG (overkill). TF-100 with Speed Stir.

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