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Thread: Leak!

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    brysclar's Avatar
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    Leak!

    I just moved into this house and inground pool maintenance has quickly become my new hobby/obsession. My pool holds about 10,000 gallons. Running the filter for 4 hours, dropped the water level about an inch. Obviously, not a good thing. I left the pump off for a day, and had barely any water loss, so I know it's a plumbing issue. Problem is, I don't see any leaks! I assume that means I'm losing dozens of gallons of water underground. That scares the bejeezus out of me. Is my assumption correct? Is there any other diy troubleshooting I can do or do I need a pro? Thanks for your help!
    10K Gal IG Freeform Fiberglass Pool
    1.5 HP Centurion Pump
    Pentair CC100 Cartridge Filter
    Hayward Automatic Pool Cleaner (model unkown)

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    Mod Squad jblizzle's Avatar
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    Re: Leak!

    Losing more water when the pump is running that when it is off typically points to a leak on the pressure side of the pump.

    I am not sure how to DIY locating the problem.
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: Leak!

    First, you need to fill out your signature so we know what kind of pool and filter you're dealing with. As the season progresses and people get more and more burnt out, you're going to find people less and less inclined to even bother trying to help people who won't share even the most basic information.

    Second, I'd suspect a leaking spider gasket in the multiport valve before I'd suspect underground plumbing breaks. But, that's just a wild guess, since I have no clue what kind of equipment you have.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    brysclar's Avatar
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    Re: Leak!

    Signature updated. Thank you, sir.
    10K Gal IG Freeform Fiberglass Pool
    1.5 HP Centurion Pump
    Pentair CC100 Cartridge Filter
    Hayward Automatic Pool Cleaner (model unkown)

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    Richard320's Avatar
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    Re: Leak!

    Well, it isn't a multiport valve since you have a cartridge filter.

    It does sound like the return side if you only lose with pump on.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    brysclar's Avatar
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    Re: Leak!

    Called in a leak locator. He found cracks in both return fittings. He sealed up the cracks with epoxy, and recommended replacing both returns for $1900. He also mentioned he saw old repairs in the returns, leading him to believe there is some movement or outside force putting undo stress on the fittings. Good news: I'm not losing water anymore. Bad news: It's only a matter of time...
    10K Gal IG Freeform Fiberglass Pool
    1.5 HP Centurion Pump
    Pentair CC100 Cartridge Filter
    Hayward Automatic Pool Cleaner (model unkown)

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    Re: Leak!

    Out of curiosity, how did he detect the leaks?
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    brysclar's Avatar
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    Re: Leak!

    He pressure tested the return lines. Neither one held. Then he visually inspected the fittings, and found cracks in both of them. After applying the epoxy, he pressure tested them again to confirm those were the only leaks.
    10K Gal IG Freeform Fiberglass Pool
    1.5 HP Centurion Pump
    Pentair CC100 Cartridge Filter
    Hayward Automatic Pool Cleaner (model unkown)

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