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Thread: too much suction?

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    too much suction?

    I have a 30x15x5 15,000 gallon pool with a cartridge filter and 1.5hp pump. The pump produces adequate pressure when first turned on and will keep that pressure for a little while. However, it always drops down and ends up outputting a very low amount of water until I turn it off and turn it back on.

    The inlet line becomes collapsed from what I assume is too much suction. Should I replace this line with some hard PVC piping?
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    30,000 gal
    inground/plaster
    salt generating
    sta-rite modul filter
    polaris

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    JasonLion's Avatar
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    May 2007
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    Re: too much suction?

    Rigid PVC would be ideal, but you could also use some higher quality hose or flexible PVC if that would be easier.

    Unless that is very cheap hose, a suction collapse like that usually suggests that there is some kind of blockage somewhere (skimmer?) raising the suction.
    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

  3. Back To Top    #3

    Re: too much suction?

    I replaced the inlet line with rigid PVC and have had stable high pressure all day! Is there any benefit to replacing the return line with rigid as well?
    30,000 gal
    inground/plaster
    salt generating
    sta-rite modul filter
    polaris

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: too much suction?

    Rigid PVC will last a lot longer.
    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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