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Thread: water flow slows down after awhile through pump

  1. Back To Top    #1

    Join Date
    May 2009
    Location
    Jasper, TN
    Posts
    249

    water flow slows down after awhile through pump

    I appear to have a Dynamo 2HP pump with a Sand-dollar sand filter.

    I do not have a timer yet.

    After a couple of hours or so, the water flow is noticeably less coming out of the return. Also, from looking in the skimmer there is less 'suction'.

    The skimmer basket is not full, nowhere near it. The basket inside the pump is clean.

    Sometimes, the flow practically stops to where you can hardly feel any water at all coming out of the return.

    The sound of the pump does not change so it doesn't appear to be slowing down.

    I can turn the pump off and wait a few hours and turn it on and everything is normal again.... for a few more hours then slows again.

    Backwashing does not make the pump run normally longer. I see no leaks, no bubbling or air rushing through line.

    Any suggestions?
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: water flow slows down after awhile through pump

    Take a look inside the pump strainer basket, through the lid, while the pump is running and see if there is any air in the basket when the flow is normal and when the flow slows down. If there is air accumulating in the basket over time and then going away when the pump is off, that could be the source of the problem.
    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

    Join Date
    May 2009
    Location
    Jasper, TN
    Posts
    249

    Re: water flow slows down after awhile through pump

    Quote Originally Posted by JasonLion
    Take a look inside the pump strainer basket, through the lid, while the pump is running and see if there is any air in the basket when the flow is normal and when the flow slows down. If there is air accumulating in the basket over time and then going away when the pump is off, that could be the source of the problem.
    There is no difference that I can see through the lid.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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