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Thread: Suction side leak on hot tub pump

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    Suction side leak on hot tub pump

    I've determined I most likely have a suction side leak somewhere underground but would like to get another opinion. I have a pool with a hot tub that can overflow into the pool. The hot tub has one return that's tied into the pool pump, filter, heater system. My issue is with the dedicated pump that would supply the rest of the return jets (5 or so) for the bubbles etc. The pump never reaches prime, the water flowing out of the returns trickles out. I redid the above ground plumbing on the suction side with no changes and also took apart the pump but that looked fine as well. Overnight the hot tub water level drops at least a few inches when the main pool pump is off. It then refills when the main pool pump turns on because the 3 way valve that diverts water to the hot tub never actually shuts off (another separate issue). The pumps are above the pool and hot tub. Any thoughts on how to determine where in the line the leak is? Would a camera on a long snake be effective in finding this kind of leak? Also wouldn't I see a significant amount of dirt accumulate in the hot tub when running this dedicated pump if the suction leak was underground?

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    cowboycasey's Avatar
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    Re: Suction side leak on hot tub pump

    Welcome to TFP

    How does your water look? May sound crazzy but sometimes the filter is clogged and not letting water flow like it should, what is the PSI on your filter when clean and now.. how high is the water in the skimmer, is there a twister/tornado look in it, that will pull air into the pump also.

    I hope this helps
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: Suction side leak on hot tub pump

    Thanks. Water is crystal clear, filter pressure around 18psi. This pump in question goes directly from the hot tub suction to the returns. There is no filtration or heat involved in this pump as far as I can tell. Recently bought the house so don't know how it was setup other than by trial and error.

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    cowboycasey's Avatar
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    Re: Suction side leak on hot tub pump

    post a couple picture of your setup from different angles, some of us on here can spot something maybe that you don't see
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: Suction side leak on hot tub pump

    Quote Originally Posted by cowboycasey View Post
    post a couple picture of your setup from different angles, some of us on here can spot something maybe that you don't see
    The hot tub booster pump is the one that says Hayward and is closest to the heater. The other pump near the filter is plumbed into all valves, filter, heater etc. I'm assuming 2 of the suction lines into the hot tub are for the booster pump and 2 are part of the filtration system. I could be wrong on the number allocated to each but definitely one is tied to the main pump and filter setup.









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    Re: Suction side leak on hot tub pump

    Any ideas on what else it could be?

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    cowboycasey's Avatar
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    Re: Suction side leak on hot tub pump

    I was hoping something would jump out at anyone.. I do not see anything out of the ordinary that would be an obvious problem..

    Hopefully this will bump it again, sorry..
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: Suction side leak on hot tub pump

    Do you know the typical process for locating an underground leak?

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    cowboycasey's Avatar
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    Re: Suction side leak on hot tub pump

    if it was the suction side you would have air in your pump basket and if on the pressure side you would have water level drop and wet areas around the pool pad or surrounding areas (maybe) if under a deck you may not see a pressure side leak..

    These may also help

    Pool School - Leak Detection
    Pool School - Suction Side Air Leaks
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: Suction side leak on hot tub pump

    I feel it's a Suction leak since the pump basket never fills all the way up. You can see the water coming into it but the water line never reaches the height of the inlet pipe.

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