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Thread: Can't detect air leak

  1. Back To Top    #1

    Join Date
    Mar 2017
    Location
    Hesperia, Ca
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    5

    Can't detect air leak

    Hey all,

    I have an air leak in my filtration system. I believe it's on the suction side and I can't find it. It's so bad I need to prime it in the AM with the hose to fill the pipe back up from the filter basket to get it to run. After that it will run all day. But the next AM it will just run dry. I've checked:

    Filter basket o-ring - good
    water level - good
    vacuum - unplugged that to make sure it wasn't coming in through the hose
    DE filter o-ring - good - no leaks

    Some thoughts and recent changes in the system to consider:

    - Recently I had my pool drained and acid washed and refilled. Seemed to run OK after that.

    - Also I replaced the thermister on the heater. It didn't seem to go in as far a the old one, but it works. Is it possible that air can be getting in through that even if the heater is not engaged?

    I have a slow water leak out of the pipe coming out of the top of the filter. Could that be the source of air getting in? See pic.

    Anyhow I'd love to hear some insight.

    Thanks,

    Jon

    filter.jpg

  2. Back To Top    #2

    Join Date
    Apr 2016
    Location
    TX
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    51

    Re: Can't detect air leak

    Hi Jon,

    The pic is of your pump, not a filter. Any water leak is potentially an air leak. Though, most air leaks tend to be suction side. That pic shows a pretty worn/corroded seal. I'd consider replacing that portion of the plumbing and ensuring a good pvc weld before looking for other leak candidates. Starting with the obvious is often the best bet.

    Good luck!

    Take care,
    Mo
    Mo - 21K gal, IG plaster, dual Pentair SuperfloXF pumps, 72 sqft DE filter, cartridge filter for the spa, dual Waterco multi-cyclone prefilters, Dual Circupool SWGs, Polaris booster and cleaner, TBD custom controller.

  3. Back To Top    #3

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    Mar 2017
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    Hesperia, Ca
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    5

    Re: Can't detect air leak

    Thanks man. I should have specified...filter basket on the pump Looks like I'll need to saw the pipe, pull that out and replace the plumbing. Fun!!

  4. Back To Top    #4
    Mod Squad Jimrahbe's Avatar
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    Jul 2014
    Location
    Bedford, TX
    Posts
    9,252

    Re: Can't detect air leak

    J,

    I believe that it is almost a crime to install a pump without the proper unions.

    They look like this.... and have an O-Ring on the threaded side.



    Unions will eliminate the problem of leaking joints at the pump input/output....

    Thanks for posting.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

  5. Back To Top    #5

    Join Date
    Apr 2016
    Location
    TX
    Posts
    51

    Re: Can't detect air leak

    Hey Jon,

    Definitely agree with Jim - the unions cost a little more than pvc-weld fittings, but they definitely a LONG way toward making things serviceable!

    How is your progress coming along?

    -Mo
    Mo - 21K gal, IG plaster, dual Pentair SuperfloXF pumps, 72 sqft DE filter, cartridge filter for the spa, dual Waterco multi-cyclone prefilters, Dual Circupool SWGs, Polaris booster and cleaner, TBD custom controller.

  6. Back To Top    #6

    In the Industry

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    Mar 2015
    Location
    New Orleans, LA
    Posts
    81

    Re: Can't detect air leak

    Check valves in front of the pump. They have o-rings that can go bad Check o-ring on pump lid. Make sure skimmers a full and doors are not stuck up. Your priming problem is air getting in from somewhere in front of pump.

  7. Back To Top    #7

    Join Date
    Mar 2017
    Location
    Hesperia, Ca
    Posts
    5

    Re: Can't detect air leak

    Fixed all the leaks except one. Still leaking most likely out of the seal plate or gasket.

  8. Back To Top    #8

    Join Date
    Mar 2017
    Location
    Hesperia, Ca
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    5

    Re: Can't detect air leak

    OK so all leaks have been fixed except one. I still have a small leak apparently in the seal plate or plate gasket on the pump. It will be fine for a couple days and then one AM it will not prime. The daily schedule is for the vacuum to run first so pump starts at a higher speed for one hour. This AM it wasn't running and no water was flowing. So I started the spa (much higher speed) and after about 30 seconds massive bubbles came out...followed by the jets and water running. Prime was good and the pump worked fine at the lower speeds.

    So can this gasket be the cause of my prime being lost? I know it's supposed to be a suction side issue, but this is sort of right in the middle of suction and return sides.

  9. Back To Top    #9

    Join Date
    Mar 2017
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    Hesperia, Ca
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    Re: Can't detect air leak

    Not sure where else to look. I am still losing my prime every AM.

  10. Back To Top    #10

    In the Industry
    blakeusa's Avatar
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    Jul 2010
    Location
    Ashford, CT
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    Re: Can't detect air leak

    O ring on pump basket.
    O rings on plugs on pump side
    Main suction connection on front of pump
    A union on the front of the pump or general area.
    A O ring on a Jandy valve before the pump.

    Make sure there is enough water in the pool so its not sucking air from a skimmer.

    Then there are seals inside the pump....

    B
    25k 20x40 Gunite w/ integrated Spa & Caribbean Blue Plaster, Curved Bluestone Coping, Deck Jets
    Pentair Easy Touch/Wireless, Sta-Rite Intellipro SRVS Pump, Intellibrite Lights, & Pentair IC40 Cell, Sta-Rite 450sf Cartridge filter
    Heated from Central Boiler - Outdoor Wood Furnace & Triangle Tube Max Heat Exchanger
    ColorQ Pro
    TF-100

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