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Thread: CYA under 30 with cold water

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    CYA under 30 with cold water

    I just opened my pool in VA so water temp is cold. I have not checked CYA yet, but if it is below 30 do I turn on heater to warm up water and then recheck or add stabilizer? My original plan was to get water right before turning on heater. Thanks in advance
    VTFanatic
    TF-100; 32K gallon plaster pool, Pentair Clean & Clear 100 sq. ft Cartridge Filter, 1 hp Pentair challenger pump

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    duraleigh's Avatar
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    Re: CYA under 30 with cold water

    Do the test. The affect of cold water on the CYA test is largely overblown. It does exist but can be mostly ignored.

    Do a CYA test at whatever temperature your pool water is.

    Now, take a sample from your pool but take it indoors and warm it roughly to room temp and take the test again. Report your results.
    Dave S.
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    Re: CYA under 30 with cold water

    My understanding is that you just need to let your sample of pool water heat up to 70 degrees for the CYA test to be accurate. You don't need to heat the whole pool to 70 degrees.
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    Re: CYA under 30 with cold water

    CYA at room temp was 90 while taken indoors. Can I do it indoors and get an accurate reading? I struggled with CYA a ton last year as I was using the pucks for the first part of the year until reading that was the cause of the high CYA. I guess I was hoping by draining so much water out for closing the pool that it would have corrected itself. Granted the pool is full given the rain that we've had. How much water do I need to drain?
    VTFanatic
    TF-100; 32K gallon plaster pool, Pentair Clean & Clear 100 sq. ft Cartridge Filter, 1 hp Pentair challenger pump

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    Mod Squad jblizzle's Avatar
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    Re: CYA under 30 with cold water

    If your CYA is 90 and the typical targets are 30-50ppm, then you are looking at needing to replace 50% of your water ... assuming you are not running a SWG.
    Jason, TFP Moderator
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    Re: CYA under 30 with cold water

    I assume I need to do this before adding any bleach, correct? I just opened the pool so have only been brushing and vacuuming thus far. Thanks.
    VTFanatic
    TF-100; 32K gallon plaster pool, Pentair Clean & Clear 100 sq. ft Cartridge Filter, 1 hp Pentair challenger pump

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    Mod Squad jblizzle's Avatar
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    Re: CYA under 30 with cold water

    No point in adding chemicals if you're just going to drain out the water right?
    Jason, TFP Moderator
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