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Thread: CYA Back up???

  1. Back To Top    #1

    Join Date
    Jul 2007
    Fort Worth, TX

    CYA Back up???

    Had minor algae, started off w/high CYA, removed 30% water, CYA reduced after refill. Then began shocking w/bleach. Algae gone, did the overnight FC test, passed. Now the CYA is back up to 100. This is a SWG plaster pool. Do we need to remove water again? I know to add acid to lower pH and maintain around 7.0-7.2 until TA down to acceptable range.

    Thank you!!

    here are current readings:

    FC 11.5
    CC 0
    TC 11.5
    pH 7.8
    T/A 130
    CH 350
    CYA 100
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    16K gallon iregular SWG w/spa, Aquarite, Legend Cleaner

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: CYA Back up???

    You might have measured the CYA level after refill too soon before the water thoroughly mixed and got diluted. You could try diluting again by 20% to get closer to 80 ppm which is where you want to be with an SWG. However, if you are at 100 and not over 100, you could just live with this for now and set your FC target at 5 ppm instead of 4 ppm. Winter rains may dilute your pool water "for free".
    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
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  3. Back To Top    #3
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: CYA Back up???

    That CYA test maxes out at 100, so your original test could have been WELL higher than that. Maybe explains why you drained, refilled, retested and are still at 100. Let's hope chem geek is closer to right than I am!
    Circulate well then test again first.
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