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Thread: help! lost pressure

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    help! lost pressure

    Everything was working fine and then this morning i lost pressure. Tried releasing the pressure from the cartridge filter, removed the lid and cleaned the skimmer and the reassembled and tried to build pressure again. It will get up to normal pressure and the suddenly release. Where do i start to troubleshoot??
    Walnut Creek, CA. 18k gallon Pebble Sheen + 1.5k gallon IG spa, 1.5hp whisperflo main pump, Pentair clean and clear 420, Intellichlor IC20, Polaris 360 w/booster,Jandy lite 2 natural gas, plus solar with Heliomatic 5000 controller and 3/4 hp booster

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    Richard320's Avatar
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    Re: help! lost pressure

    I'd look for a stuck skimmer weir (flapper) and/or low water level. Either one can cause the pump to suck air instead of water.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: help! lost pressure

    I agree with Richard320. I think you are sucking air from the skimmer.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: help! lost pressure

    Is the water level in the pool low? That will cause it too.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: help! lost pressure

    well, the water was not particularly low, it was covering the skimmer a little less then half way up, i added enough to get it to halfway and got my pressure back. I dont see why that would be such a big problem but I am forever grateful for the replies and I thank you folks for the help. This board is awesome.
    Walnut Creek, CA. 18k gallon Pebble Sheen + 1.5k gallon IG spa, 1.5hp whisperflo main pump, Pentair clean and clear 420, Intellichlor IC20, Polaris 360 w/booster,Jandy lite 2 natural gas, plus solar with Heliomatic 5000 controller and 3/4 hp booster

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    Mod Squad Bama Rambler's Avatar
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    Re: help! lost pressure

    Glad it was that easy.

    When the water gets low in the skimmer it causes the skimmer to create a vortex due to the speed that the water is moving and sucks in air and that causes the pump to lose pressure.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: help! lost pressure

    Spoke too fast. It runs for a couple hours at normal pressure and then, poof! Drops to zero. What the heck?
    Walnut Creek, CA. 18k gallon Pebble Sheen + 1.5k gallon IG spa, 1.5hp whisperflo main pump, Pentair clean and clear 420, Intellichlor IC20, Polaris 360 w/booster,Jandy lite 2 natural gas, plus solar with Heliomatic 5000 controller and 3/4 hp booster

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    Mod Squad Bama Rambler's Avatar
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    Re: help! lost pressure

    Check the skimmer and see if it's creating a vortex. If it is then it's probably the weir like Richard said. It should swing freely in the mouth of the skimmer. If it sticks or hangs even a little it will cause the pump to sucks in air.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: help! lost pressure

    Hmm, dont have a weir. Pool was here when i bought the house last winter and it never had a weir.
    Walnut Creek, CA. 18k gallon Pebble Sheen + 1.5k gallon IG spa, 1.5hp whisperflo main pump, Pentair clean and clear 420, Intellichlor IC20, Polaris 360 w/booster,Jandy lite 2 natural gas, plus solar with Heliomatic 5000 controller and 3/4 hp booster

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    Mod Squad Bama Rambler's Avatar
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    Re: help! lost pressure

    Are there tabs where a weir should go?
    Check for the vortex anyway.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: help! lost pressure

    Dave J, I think you are totally right about this. I stuck my arm in the skimmer to feel around for some mounting holes for the weir door. During that process I managed to create a wave that denied the skimmer some water for a second and I saw this vortex of which you speak. Lo and behold, the pressure released just then. So, I think I really need a weir door and to keep the water full. Everyone who has repsonded had the proper instinct, which is amazing to me.
    Walnut Creek, CA. 18k gallon Pebble Sheen + 1.5k gallon IG spa, 1.5hp whisperflo main pump, Pentair clean and clear 420, Intellichlor IC20, Polaris 360 w/booster,Jandy lite 2 natural gas, plus solar with Heliomatic 5000 controller and 3/4 hp booster

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    Re: help! lost pressure

    Everyone who has repsonded had the proper instinct, which is amazing to me
    Most of the responders here hold diplomas from the University of Been There Done That.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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