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Thread: How much water loss is a leak

  1. Back To Top    #1

    Join Date
    May 2016
    Merced CA

    How much water loss is a leak

    I have a gunite pool that was installed in 1967, it is 15 x 36 kidney with an 8' deep end. About 5 years back I noticed that it was losing water at around 2" over a 3 or 4 day period, I installed a timer water valve to replenish the loss. This winter the city put us on meter so I have decided to fix the leak, I have determined that the leak is on the suction side, I plugged the return line at the skimmer and did the bucket test. It has lost 1/2" over a 3 day period, some must be from evaporation, it has been in the low 90s the last week. How much is normal? The old suction line has been rerouted and changed a few times over the years and the paving stone deck is sagged over it in a couple of spots. My plan is to reroute the suction line in a straight shot with 1 piece of PVC from the skimmer to the pump house to eliminate any danger of leaks from fittings.

    Jim A.

  2. Back To Top    #2

    Join Date
    Aug 2010
    Dallas, TX

    Re: How much water loss is a leak

    To Pool School for you!
    Pool School - Leak Detection

    Read about "Bucket test"

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  3. Back To Top    #3
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: How much water loss is a leak

    +1 on the bucket test to rule out evaporation to see if you have a leak. But, that isn't too bad. 1/8th"-1/4" a day is pretty normal.
    TFP Moderator
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  4. Back To Top    #4

    Join Date
    Nov 2015
    Carrollton tx

    Re: How much water loss is a leak

    If you did the bucket test that eliminates the evaporation
    If the water in the pool fell more than the water in the bucket then the difference is a leak

    if you have sagging decking you may have found the leak

    Mine leaks about 7000 -9000 gallons a month based on my water bill
    which is about 233-300 gallons a day
    If some of that is evaporation im still losing a couple hundred gallons a day ... And the city will not like me much once the sprinklers are needed for the grass

    Im hoping the replaster will fix some of the leak. Ive already had a pro do the dye test and pressure test
    found leaks in skimmers and addresses them but that didnt slow the water loss

    good luck on yours
    Doug - Purchased 1/2016, 1995 house with 16x31 ft, ~23000 gallon Gunite pool w 11x7 spa, 3 Pentair VS pumps, a boost pump for polaris 3900 and a BaduŽ Jet super-sport swim jet pump, 1.5 hp blower, a CL460 Cartridge filter. TF-100 test kit. Aquapure SWG, iAqualink - Lots to learn. New Aquabright, Jandy LEDs, CMP LED Sheers.

  5. Back To Top    #5
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: How much water loss is a leak

    On the bottom of page 17 of this PDF document -

    You'll find pan evaporation data for Merced, CA. It's old data, but it can give you a feel for how evaporation varies with the season. Based on that data, I think the loss you are seeing is definitely a leak.
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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