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Thread: CYA is low and cannot seem to raise it - now what?

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    Join Date
    Jul 2010
    Southern NH

    CYA is low and cannot seem to raise it - now what?

    Hi Everyone!
    CYA test as of this afternoon is reading between 20 - 25. We've added nearly 7 lbs of stabilizer at this point and it still will not go up. We did try to add about 4 lbs of it when we were shocking - could this have prevented it from actually being absorbed? We've also washed our filter out during the shock process...which I assume also washed some out.

    Last addition was early last week, and that was about another 2 lbs. Do we just keep slowly adding more in, using the sock in skimmer method, or is there a better way?

    According to the recommended levels, we want to be around 70 - 80, correct? At this point, i don't see how we'll ever get there! We've been trying to keep our FC around 4 - 5 ppm...but have had some fluctuation due to learning how to use our SWG!

    Thanks for any tips or advice - it's always appreciated!
    16x34 Oasis IG Liner Pool with Cozy Cove, Sta-Rite s7m120 Mod Media Filter (1 hp), Sta-Rite Max-E-Pro Pump, Sta-Rite Max-E-Therm Heater, LED lights, Hayward Goldline Aqua-Rite SWG (T-15 Cell) and TF-100 Test Kit

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    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: CYA is low and cannot seem to raise it - now what?

    Are you adding straight CYA separately or are you using stabilized chlorine? If you broadcast CYA into the pool and then backwash within a couple of days then you may have lost some CYA there. If you have been using a sock to add CYA backwashing should not affect the CYA level. If you have been using straight CYA check the % of CYA on the label.

    CYA can take about a week to register on the test. Also how have you been testing the CYA levels? Test strips are notoriously inaccurate, especially for CYA readings.
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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