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Thread: Leak? Typical Water level drop?

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    Leak? Typical Water level drop?

    I'm sure this has been discussed, I did a search but couldn't find my answer... my apologies.

    Anyway, just purchased a house with a pool about 2 weeks ago. Loving it for the most part, but I can definitely see that it's gonna be alot of work, but I know it will be worth it.

    It's an older gunite pool, about 25K gallons, and the previous owner informed me after closing he thinks it has a small leak. I found three seperate spots in the above ground plumbing that was leaking water and plugged up all three yesterday by fixing various items. Everything seems to be perfectly dry over there now.

    After I plugged all those leaks I marked the pool then put on an automatic pool cover and left it covered for a day. 24 hours later the pool is down 1/8 of an inch. I asked the guy at Leslie pools and he said 1/4 of an inch is typical every day or two, sometimes even with the pool covered. Is this accurate? How much water level drop should I expect in 24 hours with the pool covered? I'm hoping that I fixed the leak but I want to be sure. Should I do a different kind of test? Should I use the bucket test that I've think I've seen on here? Does anyone have a linkt o a thread that describes it in detail?

    Thanks in advance for all the help, I can tell this is a very informative board where I'll be coming often.
    40' x 22' - 42,000 gallons - In Ground plaster - Pentair IC60 SWCG - Pentair CCP420 Cartidge Filter - Sta-Rite Max-E-Pro Pump

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Leak? Typical Water level drop?

    Welcome to TFP.
    Where are you located?

    1/8" per day is a pretty small loss.

    I'd run the bucket test and see if it shows anything.

    Fill a bucket with pool water and sit it on a step in the pool and mark the level in it and in the pool. If the pool loses more water than the bucket you have a leak.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    In the Industry
    Qwaxalot's Avatar
    Join Date
    Jun 2012

    Re: Leak? Typical Water level drop?

    Don't know how big your pool is, but a 1/8th inch a day leak is virtually impossible to detect. By all means try the bucket test. Don't be optimistic about finding it.
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

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