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Thread: Rain and cya levels

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    Rain and cya levels

    We have had a lot of rain lately so I had to dump some water Before that, my cya levels were 140. , now they are down to 100. Will a little dumping reduce the cya that much. I was planning on draining about 40% at end of season now I'm not so sure I will need to. Any thoughts?
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    Mod Squad Bama Rambler's Avatar
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    Re: Rain and cya levels

    It's strickly a percentage. If you replace 25% of your water with CYA free water (i.e. rain) then your CYA will go down by 25%. Another problem is that above 100 ppm the CYA tests aren't accurate at all.

    How did you test the CYA?
    Dave J. TFP Moderator
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    Patrick_B's Avatar
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    Re: Rain and cya levels

    Quote Originally Posted by Thesil
    We have had a lot of rain lately so I had to dump some water Before that, my cya levels were 140. , now they are down to 100. Will a little dumping reduce the cya that much. I was planning on draining about 40% at end of season now I'm not so sure I will need to. Any thoughts?
    It certainly could depending on Rain Level and dumping amounts. You are still too high at 100 however. If you have a SWG you can just take it down to the 60-80 range. If you don't, I would suggest taking it down to the 30-50 range.
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    Re: Rain and cya levels

    I tested with the Taylor kit
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    Mod Squad Bama Rambler's Avatar
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    Re: Rain and cya levels

    Did you use the dilution method to get the 140 ppm number?
    Dave J. TFP Moderator
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    Richard320's Avatar
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    Re: Rain and cya levels

    It's much easier to test the pool with lower CYA - your minimum FC level will be in the range where the color matching test works. Otherwise it's FAS-DPD every time. Grab as much of that rain as you can! Also note that whatever % CYA goes down, salt will go down as much, so you'll need to replenish it.
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    Re: Rain and cya levels

    Yes I used the dilution method to get the 140 number
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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