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Thread: Where did CYA go?

  1. Back To Top    #1

    Join Date
    May 2014
    Hunterdon County, NJ

    Where did CYA go?

    When I started this whole process a few days ago my CYA was close to 90. I would estimate that I have had a 4-5" water exchange ending in 2 inches of rain as of this post. Is it possible for me to loose 10ppm of CYA with that?
    My evening test results are

    pH 7.5
    FC 9
    CC 0
    Ch 100
    Alk 140
    CYA 60

    I ran the CYA Test 4 times (dumping and refilling the tube)

    Everything else seems good, is this possible with that little water exchange?
    20500 gallon Grecian type 2 pool built in 1980's, Vinyl liner aprox 2001
    2 Skimmers, 1 Dedicated Vac Line and 3 returns
    Hayward super pump - Hayward in line Chlorinator
    Triton TR-60 Sand filter
    Dolphin M3 robot, TF-100 with XL option & Speed Stir

  2. Back To Top    #2
    Casey's Avatar
    Join Date
    Apr 2007
    SW PA

    Re: Where did CYA go?

    Yes it is. I lost 15ppm CYA in 2 days from dumping 4" of water off my pool and I expect to lose more. I started with 40 and now I'm at 25 so... It's possible. Just keep an eye on it.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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