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Thread: What would cause pump pressure to do down?

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    Join Date
    Sep 2011
    Location
    Atlanta Ga
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    310

    What would cause pump pressure to do down?

    A few days ago the pressure guage said 13, which is has been since in installed it a month ago. Today it is 11.5. I have not backwashed. What would cause pressure to go down?
    36 x 18 oval pool, inground, plaster pool.
    27000 gallons
    1 hp pump. Sand filter
    Pool built in 1971.

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    Join Date
    May 2009
    Location
    Dallas, TX
    Posts
    782

    Re: What would cause pump pressure to do down?

    2 possibilities:
    Air in the line (suction leak)
    Blockage (skimmer basket full)
    20K gal IG plaster pool, Manually chlorinated with bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

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    bobodaclown's Avatar
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    Apr 2011
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    Murrieta, CA
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    2,360

    Re: What would cause pump pressure to do down?

    crud in the impeller.
    Murrieta, CA. 15K (Est) pool/spa. Hayward Tristar SP3220EE 2.70HP pump, Hayward Swimclear Cartridge filter C4025 425sqft (PA106), Pentair Mastertemp 400 heater. TF-100/Speedstir

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    Join Date
    Sep 2011
    Location
    Atlanta Ga
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    310

    Re: What would cause pump pressure to do down?

    crud in the impeller.
    I didn't know what an impeller was, but just found out on wikipedia. So if that is the cause, is there any way to fix it? The pump is only one year old.

    Air in the line (suction leak)
    When the leak detector guys came out they said there was a small suction leak in the line coming from the skimmer. They said it was not big enough to cause water loss but would get a little air into the system. Maybe that is is slowly getting worse.

    They fixed the more serious leaks that were causing water to go down. I guess I will eventually need to dig up that line and fix it.
    36 x 18 oval pool, inground, plaster pool.
    27000 gallons
    1 hp pump. Sand filter
    Pool built in 1971.

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    bobodaclown's Avatar
    Join Date
    Apr 2011
    Location
    Murrieta, CA
    Posts
    2,360

    Re: What would cause pump pressure to do down?

    Depending on the pump it may be easy to check/clean the impeller. I recently had an oak tree drop lots of stuff into the pool and it got by both baskets. The tree droppings look like worms when wet, pollen pods for lack of a better term, clogged the impeller. On my pump (Duraglass) it's easy to get to the impeller and clean it out. It isn't hard to do, but you need to separate the motor from the housing to get access to the impeller. The impeller is connected to the motor shaft.
    Murrieta, CA. 15K (Est) pool/spa. Hayward Tristar SP3220EE 2.70HP pump, Hayward Swimclear Cartridge filter C4025 425sqft (PA106), Pentair Mastertemp 400 heater. TF-100/Speedstir

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