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Thread: Does cya evaporate?

  1. Back To Top    #1

    Join Date
    Apr 2015
    Central New York

    Does cya evaporate?

    I know you need to drain water and add fresh water to reduce cya. Does it also go down when water evaporates? On a hot day I lose an inch of water. When I add fresh water am I lowering the cya as if drained and filled? Thanks.
    In-Ground,14000 gallon, 15x33 fiberglass pool, starclear plus 1200 cartridge filter, tablet chlorine feeder, Hayward 1.5 hp pump, unheated

  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Does cya evaporate?

    No, the CYA stays in the pool, it does not evaporate. When your poo level goes down due to evaporation the CYA level actually goes up, but it is such a small amount it really can't be seen in the testing.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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