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Thread: Main Drain Leak - HELP!

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    Join Date
    Aug 2014
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    Main Drain Leak - HELP!

    After closing the pool I discovered that I was losing 1/2" of water per day. I waited to see if it would stop so I could use the dye on the plumbing, but it hasn't. I am below the skimmer and the inlets by 6". At this point my guess is the main drain.

    Question: what are my options being that it's 40 degrees here in upstate NY and won't be getting warmer any time soon. (The pool opening usually happens around mid-May at the earliest.)

    Is there anything I can do other than to hose fill the pool and then monitor it during the winter months? Is there such a thing as a main drain cover that will seal itself off?

    I estimate that it will cost me about $80 in water until I can get in the pool in May. Not a killer but I'd like to know that I'm not overlooking other options.
    Pool is 16 x 32 in-ground with steps.
    Installed May 1987 , vinyl liner (on 2nd liner)
    Hayward 3/4hp Super Pump with 200lb sand filter; skimmer, main drain & 2 returns.
    Hayward H250FDN heater; AutoPilot SWG (Digital) & AutoBot Pool Cleaner (T4RC)

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    Divin Dave's Avatar
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    Re: Main Drain Leak - HELP

    Hi Dave,
    Do you have a pool light? The light conduit is famous for leaking too. Usually, its the nipple on back of the niche that cracks.

    I also notice you have a vinyl liner. It will not be good if the water drops any lower than about 6 inch deep in the shallow end. if it gets lower, the weight of the water in the deep end will start uplling on the liner and could either end up in some bad wrinkles that will be about impossible to remove.

    Not the best of news and I really dont know what opitons in your area you might have of finding someone to fix it.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Main Drain Leak - HELP

    Divin Dave, thanks for the response.

    No pool light. Right now the water level is below "all" plumbing except the main drain of course.

    I guess the "options" answer I am looking for is "what can I do between now and mid-May?"

    By filling it I'm feeding the leak but protecting the rest of the pool. Not ideal - but - it's not like this is the summer and I can check things out or have them checked out.
    Pool is 16 x 32 in-ground with steps.
    Installed May 1987 , vinyl liner (on 2nd liner)
    Hayward 3/4hp Super Pump with 200lb sand filter; skimmer, main drain & 2 returns.
    Hayward H250FDN heater; AutoPilot SWG (Digital) & AutoBot Pool Cleaner (T4RC)

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    Re: Main Drain Leak - HELP

    To all that read this: Google "main drain suction mat" and tell me your thoughts.

    Do I think it will cut down on the leakage? "I DON'T KNOW!!!"

    Is it worth trying? "I DON'T KNOW THAT EITHER!!!

    In theory it "might" work but what's stopping it from just moving over time? (Do I place water jackets on top of it? Again, I don't know what I don't know.)
    Pool is 16 x 32 in-ground with steps.
    Installed May 1987 , vinyl liner (on 2nd liner)
    Hayward 3/4hp Super Pump with 200lb sand filter; skimmer, main drain & 2 returns.
    Hayward H250FDN heater; AutoPilot SWG (Digital) & AutoBot Pool Cleaner (T4RC)

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    Divin Dave's Avatar
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    Re: Main Drain Leak - HELP

    Dave,
    I googled the main drain suction mat. It might slow down the leak a bit, but I have doubts it would stop it. I would think for long term, it would need to be weighted down. The gamble is the cost of the mat.

    It might be worth a try calling pool store to see if they scuba dive in cold water. All they could do is say no.

    I would also recommend that you consider editing the name of this thread to something like Main Drain Leak.. or similar, so that the speicific problem is more visible to others on the forum. "Leak" is pretty generic and cover lots of things.... and a lot of folks who maybe can help might just pass over this thread.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

  6. Back To Top    #6
    Divin Dave's Avatar
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    Re: Main Drain Leak - HELP!

    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

  7. Back To Top    #7

    Join Date
    Oct 2015
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    Katy/Texas
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    411

    Re: Main Drain Leak - HELP!

    People SCUBA dive in colder water than yours with the right equipment.
    In ground, 14,000 gallon, white plaster, unheated, stone waterfall, DE Filter, Rainbow 320 Cl, Polaris 3900, FloVis flow meter, F100 test kit, Circupool RJ30+ SWG, Circupool VJ1/Speck Badu EcoM3V variable speed pump.

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    philc's Avatar
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    Grand Island Nebraska
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    190

    Re: Main Drain Leak - HELP!

    Heck I would come over to your place and dive your pool if I were closer. Any local dive clubs you could contact to see about a diver?
    Intex 22' X 52" Ultra Frame AGP ( 12K gallons) , Intex 633T 2500 GPH (41 GPM) running Doughboy Silica II sand filter (16"dia. 1.4 ' S.A.) ( And doing it quite well, I might add!) Hayward through the wall skimmer, TF100 with Speed Stir. Hard plumbed, Intex fountain ...........

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    Re: Main Drain Leak - HELP!

    I have the names of a few divers that do pool repair. I will be calling them on Thursday (12/3/2015) to get options.
    Pool is 16 x 32 in-ground with steps.
    Installed May 1987 , vinyl liner (on 2nd liner)
    Hayward 3/4hp Super Pump with 200lb sand filter; skimmer, main drain & 2 returns.
    Hayward H250FDN heater; AutoPilot SWG (Digital) & AutoBot Pool Cleaner (T4RC)

  10. Back To Top    #10

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    Re: Main Drain Leak - HELP!

    I called today about my pool leak. I was told by the owner/diver that at this time of year it is best to just fill the pool with water ($2.71 per 1000 gallons) and in the spring he will come out and check it out. (He gave me a price of $150 for him to check it out and fix the leak.)

    So, pretty much what I figured would happen being it's December in upstate NY - but - I was pleasantly surprised with a non-scary estimate. (I know, I know, it's not the estimate that kills you, it's the final price.)
    Pool is 16 x 32 in-ground with steps.
    Installed May 1987 , vinyl liner (on 2nd liner)
    Hayward 3/4hp Super Pump with 200lb sand filter; skimmer, main drain & 2 returns.
    Hayward H250FDN heater; AutoPilot SWG (Digital) & AutoBot Pool Cleaner (T4RC)

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