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Thread: CYA fluctuating

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    Join Date
    Jun 2016
    Location
    Austin, TX
    Posts
    328

    CYA fluctuating

    Hi, I have a question about the CYA test. When I go my new house the CYA was 50/60. It is an SWG pool. I tried to raise it to 70 to start so I don't overshoot it so I added 2 lbs cya in a sock in the skimmer. I finally tested it at 70 about 24-48 hours after adding. Now a week later when I test I'm lucky to get 50. I tried the standard 50 sample and I get near 50 every time. I have had to add about and inch or 2 of water since adding the CYA. I have also add a ton of calcium to increase that from under 200, can that take away CYA or is something consuming CYA or should I add more?

    Numbers as of last night:

    FC - 9
    CC - 0
    pH - 7.5
    CYA - 50/60?
    TA - 100
    CH - 375
    13k Gallon IG Pebble w/ attached Spa, AquaRite T-Cell-15 SWG, Hayward DE6020 Filter, Hayward 2 HP Pump, Hayward 400k Heater, TF-100 Kit, Pool Logger

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
    Posts
    8,494

    Re: CYA fluctuating

    CYA does not fluctuate, testing does. Calcium does not consume CYA.

    You say you have added water, is that because of evaporation or water leaving the pool through physical means, like back washing?

    If you were in the 50/60 range and added two pounds, it is still there unless you pumped water out of the pool.
    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

  3. Back To Top    #3

    Join Date
    Jun 2016
    Location
    Austin, TX
    Posts
    328

    Re: CYA fluctuating

    I only added water due to evaporation. It was only 1 inch above the skimmers when I took possession.
    13k Gallon IG Pebble w/ attached Spa, AquaRite T-Cell-15 SWG, Hayward DE6020 Filter, Hayward 2 HP Pump, Hayward 400k Heater, TF-100 Kit, Pool Logger

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