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Thread: CYA and Chlorine Levels

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    CYA and Chlorine Levels

    Through years of trying to get rid of algae by shocking (no longer do that by the way) my CYA level is upwards of 100. I keep my free chlorine level at the recommended level for the CYA and the water is absolutely sparkling crystal clear. I know I have to dump water and refill to fix the problem but would like to hold off a bit since right now the pool is seeing quite a bit of use. My question is would a free chlorine level of around 10-12 cause any harm to the liner or anything else?

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    Mod Squad jblizzle's Avatar
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    Re: CYA and Chlorine Levels

    As long as you keep the FC at the recommended ranges based on the CYA, then you are not putting the liner at risk.
    But, remember when FC > 10ppm, the pH test is not valid.
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    Re: CYA and Chlorine Levels

    I did not know that! Maybe that is why my PH is reading a bit high sometimes?? Shall I make sure the FC level is below 10 and then do a PH test from now on?

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    Richard320's Avatar
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    Re: CYA and Chlorine Levels

    Quote Originally Posted by ChiefRob View Post
    I did not know that! Maybe that is why my PH is reading a bit high sometimes?? Shall I make sure the FC level is below 10 and then do a PH test from now on?
    That is one solution. It gets old fast, though.

    I just finished draining about 6" out of my pool to lower CH. At an average depth of 60", that's 10%. That much water can be refilled in a couple hours and won't totally mess up the chemistry. Do that a few times and you'll have CYA down to something useful.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: CYA and Chlorine Levels

    Good idea, I will give that a shot. Actually we had horrendous rains here on Long Island recently. My water level is quite high, I will reduce it and fill it back up and see where it gets me.

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    Mod Squad jblizzle's Avatar
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    Re: CYA and Chlorine Levels

    Have you done the diluted CYA test? Starting with 50/50 mix of pool and tap water and doubling the CYA reading? Give you a better idea of how high your CYA actually is.
    Jason, TFP Moderator
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    Re: CYA and Chlorine Levels

    If there is a big rain coming you can also do some rainwater harvesting:

    http://www.troublefreepool.com/threa...vesting-and-TA
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: CYA and Chlorine Levels

    jblizzie, so if i dilute the pool water 50% and my cya is down to 50 instead of 100 that would mean i have to replace roughly 50% of the pool water correct?

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    Mod Squad jblizzle's Avatar
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    Re: CYA and Chlorine Levels

    I don't understand. If you use 50% pool and 50% tap water, then add the reagent and test. Then whatever reading you get, double it and that is your CYA level.

    If you happen to read 50ppm, then you CYA is around 100ppm and to get to the recommended range you would need to replace 50% of the water (this amount of water replacement has nothing to do with the fact that you use 50% pool/tap water)
    Jason, TFP Moderator
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    Re: CYA and Chlorine Levels

    Sorry I was a bit confusing. I tried to basically spit out exactly what you said! I will be doing that test this afternoon. Thanks!

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