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Thread: CYA Measurements below Room Temperature

  1. Back To Top    #1

    Join Date
    Mar 2013
    Houston, TX

    CYA Measurements below Room Temperature

    Hi. Quick question:

    The extended instructions for the CYA test in TF-100 test kit tell me to "allow the water sample to warm up to room temperature (70) before continuing". I did the test for a friend with water that was at 61 degrees. Is there a difference in the end result that is large enough that I should retest?

    18,000 gallon IG Gunite pool. White Pebblesheen. Flagstone Coping. 9' diameter level spa. 430sf Hayward Cartridge Filter. 2.5hp Hayward Ecostar VSP for filter. 1hp Hayward Super II Pump for waterwall. 400k BTU Hayward Universal H-Series natural gas heater. Ozonator (it was free). Hayward Prologic PS8 Controller.

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: CYA Measurements below Room Temperature

    It's probably OK, but if you didn't wait long enough that it might read lower than the true value. The reaction is slower at colder temperatures. On the other hand, if you wait longer at the colder temperature, the reading can be artificially high since the precipitate is less soluble (though in the Taylor test they try and minimize that effect by lowering the pH). See this post that indicates that at 60F your reading is probably OK. It's at 40F that if waiting long enough it reads artificially too high for the CYA test.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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