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Thread: Inground Pool Looses Significant Water After Heavy Rains

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    Inground Pool Looses Significant Water After Heavy Rains

    Hi everyone. I have an inground fiberglass pool (called an "iPool2" by San Juan Pools). It has a small spa on one end and the pool part has an infinity edge. This is a weird pool because there is no skimmer. I have three pumps servicing the pool; one is the main pump which handles the pool and spa suction and return lines, another pump which runs the polaris and a third that pumps the water captured off the infinity edge in an "overflow basin" back into the main pool. The pool and spa have two main valves which control A) the amount of suction going to each area (spa or pool) and B) the amount of water going to each area from the return lines. Although I've had three pool companies come out and test for leaks (pressure testing lines and sonar test) and all say there is no leak. However, the pool still looses water (maybe an inch every other day and the pool holds 9,000 gallons) and especially whenever it rains. We just had a really hard rain (2-3") and the water in the spa is almost completely gone. The pool, however, is full and water is even flowing out of the infinity "overflow basin" into the yard. Whenever this happens, all I know to do is cut off all suction on the spa side and put 100% of the water coming from the return lines back into the spa. This way the pool area will have 100% of the suction and 0% of the return. The spa will fill back up rather quickly this way but the overall water level of the pool is down and it normally takes 3-4 hours to fill it back up.

    Here is a rough diagram I made of the pool. Any thoughts?

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Inground Pool Looses Significant Water After Heavy Rains

    Welcome to TFP!!!

    Losing 1/2" of water a day is in the normal range, especially if you are in a dry windy area.

    Not sure why the spa empties, but it is not very typical to have the suction coming from both the pool and spa at the same time kind of for this reason. Just put all suction from the pool and return some to the spa and allow it to spill over.
    Jason, TFP Moderator
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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Inground Pool Looses Significant Water After Heavy Rains

    Does it do that whether the pumps are running or not?

    How often and how long do you run the edge pump?

    How often and how long do you run the main pump?

    How much is the spa above the pool area?
    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
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