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Thread: Refilling pool after drain (CYA way too high)

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    Refilling pool after drain (CYA way too high)

    I had to drain my pool because my CYA was way over 200! This experience taught me about this site and to never trust a pool store again. It is a few hours away from being filled and the pump started again. The water here in Dallas is very alkaline. I need to get everything balanced, but don't know what to do first and would appreciate some advice.

    FC - 0
    pH - 8
    TA - 50

    Thanks.
    Kathyo in Texas
    21k gallon IG gunite w/ spa & waterfall; Waterway filter 817-0106; Polaris 280 cleaner

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    Join Date
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    Dallas, TX
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    Re: Refilling pool after drain (CYA way too high)

    Get your pH down first (add muratic acid). Get some chlorine in there pronto - it's hot and sunny here!!
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: Refilling pool after drain (CYA way too high)

    ko,

    Yeah reduce that pH first.....down to around 7.4 is a good number. Did you do a complete drain so your CYA will be zero? post that back and let us know.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Refilling pool after drain (CYA way too high)

    I had to drain at least 75% of the water, so we decided to drain almost all of it since we had rented the pump and had just done a drain & refill 18 months ago because of calcium. We got in trouble again because we used the Leslie's chlorine (w/ CYA).

    So I add the acid first to reduce pH. Can I add the bleach right after that? Or do I need to wait?

    thanks.
    Kathyo in Texas
    21k gallon IG gunite w/ spa & waterfall; Waterway filter 817-0106; Polaris 280 cleaner

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    Re: Refilling pool after drain (CYA way too high)

    I would suggest doing it in this sequence....

    1. Lower pH with acid....pump running 24/7 during this entire process

    2. One hour later, Do a CYA test and a pH test to check where you are.

    3. Then, dose the pool with chlorine according to the FC/CYA chart.....20% or so higher won't hurt a thing for this first go round.

    4. If necessary, adjust your CYA to around 50 and then keep your chlorine in the 4-6 range based on the FC/CYA relationship chart.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Refilling pool after drain (CYA way too high)

    Thanks. I did the acid and it is now back to 7.4. CYA is 0 (since I it is full of city tap water now). I'll have to get some CYA tomorrow to bring it up. It seems strange to add CYA after having to drain due to too much. For tonight, I put in some of the Leslie's tabs that I have that have stabilizer in them. I'll run it all night and test again in the morning. Thanks for your help. This forum is a god-send.
    Kathyo in Texas
    21k gallon IG gunite w/ spa & waterfall; Waterway filter 817-0106; Polaris 280 cleaner

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