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Thread: is this right?

  1. Back To Top    #1

    Join Date
    Aug 2008
    Collierville, TN

    is this right?

    I tested the water in my pool yesterday

    FC 1
    CC 0
    Ph 7.3
    TA 110
    CYA 100ish (maybe even 90)
    CH 90

    Because of the high CYA, I needed to get my FC up to around 10. I used the pool calculator and figured I needed to add 3 gallons of bleach. Today, I went out and checked and the FC was only 3.5. Can that be right? Am I doing something wrong?

    approx. 30000 gallon IG 40x20 vinyl pool w/ cartridge filter

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: is this right?

    If you just opened the pool for the spring, it is likely that there were, and perhaps still are, some organics in the water that need to be burned out with chlorine. A rapid loss of chlorine the first few times you add chlorine after opening the pool is fairly common. You should keep raising the FC level to at least 15, and perhaps a little higher, until the FC level holds steady overnight. If the water turns at all cloudy or murky then raise FC to 25 until it holds overnight.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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