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Thread: Water replacement...am I approaching this correctly?

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    Newpoolcrazy's Avatar
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    Post Water replacement...am I approaching this correctly?

    Out of CYA reagent. It's on order, but it's late. I know a little rain doesn't make a difference with most things, but we were in that rain event where we drained about a foot of water out of our pool in 3 inch increments and it was replaced by rain water each time. Do you think this will lower my CYA much?

    What I'm doing is still shooting for the same FC as if my pool still had a CYA of 50 until I can test and see if it was lowered enough to need adjustment. Is this how I should proceed? I don't want my pool over chlorinated, but since no one is swimming because of weather anyway, I assume a little on the high side is better then low, yes?

    See? Just when we think I've got it, I get all newbie on you again.
    Cornelius Monterey Steel/Resin AG 18' round (approx. 7600+gallons) Hayward veri-flo SWG w/sand filter.Testing w/ TK2006 using Speed stir.

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    Mod Squad jblizzle's Avatar
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    Re: Water replacement...am I approaching this correctly?

    Replacing 1 foot of water in increments lowered the CYA by 20-25%

    Safe to swim up to shock level FC, so I would certainly err on the high side.
    Jason, TFP Moderator
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    Mod Squad kimkats's Avatar
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    Re: Water replacement...am I approaching this correctly?

    Not a bad question at all. (no question is bad) With that much rain/drain your CYA will be lower.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Newpoolcrazy's Avatar
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    Re: Water replacement...am I approaching this correctly?

    So I could be down to a CYA of 40ish. I'm sticking with the plan. Thank you for helping me feel better in that decision.


    Quote Originally Posted by jblizzle View Post
    Replacing 1 foot of water in increments lowered the CYA by 20-25%

    Safe to swim up to shock level FC, so I would certainly err on the high side.
    Cornelius Monterey Steel/Resin AG 18' round (approx. 7600+gallons) Hayward veri-flo SWG w/sand filter.Testing w/ TK2006 using Speed stir.

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