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Thread: CYA adjustment before salt addition

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    Join Date
    Apr 2016
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    Portland, OR
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    CYA adjustment before salt addition

    Preparing to add NaCl this weekend. Have the TFP Kit, CYA is over 100, If I dilute current pool water by 50% then it goes to approx 60. Currently dumping water. The pool was previously chlorinated with tablets. Question, how did CYA build-up so high in the pool? Did years of tablet use and stabilizer addition create this scenario, or does it happen by some other mechanism? Tempted to drop the pool volume to around 40% prior to refill to allow for a target CYA of about 50? Thoughts?

    Thank you...
    18x36 in-ground, ~29k gallons, Pentair 3HP VS, Pentair CC+ 420, IC-40, EasyTouch Panel, In-ground cover, 100% DIY-reworked pad (thanks to help from this forum), TFP Test Kit, Near-antique heat pump...

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    Texas Splash's Avatar
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    Re: CYA adjustment before salt addition

    how did CYA build-up so high in the pool? Did years of tablet use and stabilizer addition create this scenario,
    Exactly! Misuse of tablets and bags of shock.

    Tempted to drop the pool volume to around 40% prior to refill to allow for a target CYA of about 50? Thoughts?
    Actually, shoot for a CYA target of 70. That's the minimum you want for a SWG pool so that you have adequate FC protection from the sun.
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    Re: CYA adjustment before salt addition

    Ok, thanks, thought so, but also did not know if it was a by-product of anything used in the TFP method. I'm aiming a bit low because I'm in the PNW where there is not a tremendous amount of sun, and because it is easier to raise, than lower. Is CYA a skin/eye irritant?

    One other Q, should I add salt, then adjust PH after the re-fill or adjust PH then add salt?
    18x36 in-ground, ~29k gallons, Pentair 3HP VS, Pentair CC+ 420, IC-40, EasyTouch Panel, In-ground cover, 100% DIY-reworked pad (thanks to help from this forum), TFP Test Kit, Near-antique heat pump...

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    TFP Guide

    domct203's Avatar
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    Jun 2015
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    Re: CYA adjustment before salt addition

    High CYA is the result of using stabilized chlorine (trichlor/dichlor).

    TFP recommends using liquid chlorine, which adds only chlorine and a trace amount of salt.

    CYA, in the levels recommended here, is not an irritant.

    Get your water well balanced first, then add your salt.

    Dom
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