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Thread: Flow of water reduces over hours

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    Flow of water reduces over hours

    Good Morning Everyone,
    I am new to the board along with being a new pool owner. This year I opened my girlfriends pool and have never done this before but everything is going well except for one strange problem. What seems to be happening is when the pool filter is running after a few hours the circulation/flow rate goes down dramatically. The pressure does not go up so I don't believe its clogged up and I have even cleaned it out once already and there wasn't much junk stuck in the DE. What I have noticed is if I shut the pump off remove the clear plastic cover on the motor where the basket is and put it back on the flow rate and circulation is great for a few more hours. It's almost like there is some kind of back pressure causing the pump not to pump much after some time. I don't see any air and there is plenty of water getting to the pump so I know that's not it. Any ideas on what the cause is would be greatly appreciated.

    Thanks
    Tim

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    Texas Splash's Avatar
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    Re: Flow of water reduces over hours

    First ... welcome Tim to TFP! It may help everyone concerned if you could provide the specifics of the pool you are working on. Much like what you see in my sig below. That will help the reader when trying to assist you. Since you "may" have a pump issue, try to be specific with the type/model and that might help as well. Thanks, and welcome again.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Flow of water reduces over hours

    Sure, so the specifics are 27' Above ground Round pool with 1 HP Hayward EC40 DE filter.
    - Tim - My Pooll 27' Round Above Ground , 52" deep; 1-hp pump; Hayward EC40 DE Filter

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    Isaac-1's Avatar
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    Re: Flow of water reduces over hours

    Are you sure you don't have a bad pressure gauge?
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Re: Flow of water reduces over hours

    I thought it might of been but it does move up and down. So I know that is working.
    - Tim - My Pooll 27' Round Above Ground , 52" deep; 1-hp pump; Hayward EC40 DE Filter

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    lefty51's Avatar
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    Re: Flow of water reduces over hours

    Just off the top of my head, I'm thinking a restriction on the suction side. You may not get bubbles (i.e sucking air) but if something like a rubber ducky or something could be making its way into suction line and reducing flow. Don't know if that would make the pump growl as it is working harder to pull water, but it can't be good on the motor. When you turn pump off whatever might be restricting flow releases and then get sucked back in on startup. I think that's where I would start looking first
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    Isaac-1's Avatar
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    Re: Flow of water reduces over hours

    The gauge may still be bad, just sticking when it gets to a certain pressure level and showing no higher.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    lefty51's Avatar
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    Re: Flow of water reduces over hours

    Quote Originally Posted by Isaac-1 View Post
    The gauge may still be bad, just sticking when it gets to a certain pressure level and showing no higher.
    Just goes to show you may never know !
    I went out last evening to drain some water off the pool (rain, rain, rain) and I noticed pressure reading 4 lbs higher than normal. Thought, ok backwash while draining.

    Low and behold gauge dropped to 2 lbs, not zero when shut off. I got curious thinking of Isaacs' post and SLOWY started to turn off return line while pump was running.

    The pressure started to rise, but not like I thought it would, so I stopped (if gauge was bad didn't want to blow the filter top off).

    Bottom line, I ordered a new gauge from TFTestkits last night ! It may not be what your problem is, but it helped me. Thanks Isaac !

    P.S.- gauge was working fine 3 weeks ago when I opened
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    Mod Squad pooldv's Avatar
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    Re: Flow of water reduces over hours

    11 bucks for an awesome gauge from tftestkits.net is a win no matter what.
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