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Thread: Is it normal to have CYA level drop?

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    Is it normal to have CYA level drop?

    So I thought the only way to reduce CYA level was replacing water...

    My level has been about 35-40 since forever, but yesterday, when I tested my water it was only 20. So I decided to drop a few puck of tabs in my floaters and slammed the pool.
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Mod Squad jblizzle's Avatar
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    Re: Is it normal to have CYA level drop?

    CYA is consumed at a very low rate. Plus losses to splashout and backwashing and rain overflow.
    And sometimes over the winter it get converted to ammonia and drops to zero, although usually in a neglected pool.
    Jason, TFP Moderator
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    Re: Is it normal to have CYA level drop?

    that's strange, I slammed my pool a few weeks ago, left it unattended for a week then had algae so I'm slamming again. For the most part, 0I only let my FC dropped to .5 for a few days, beside the green algae on the wall, the water is clear. Could there be something else wrong with the pool?
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Propbndr's Avatar
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    Re: Is it normal to have CYA level drop?

    The low FC allowed the algae to take off again. You need to repeat the SLAM process.
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Is it normal to have CYA level drop?

    Yeah, if you ever let the FC drop below the minimum for your CYA, you could be heading for trouble.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Is it normal to have CYA level drop?

    Been slamming for 2 days first day i spiked my fc 15 today its at 12.5 im going to let it drop down to 10 and see what happens if needed ill keep it there for a couple days but so far i see no algae.
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Mod Squad pooldv's Avatar
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    Re: Is it normal to have CYA level drop?

    It is hard to see a low level algae outbreak. It is usually detectable by slimy side walls, filter clogging up faster, higher daily chlorine consumption. Then water gets progressively more cloudy. Then green.
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    Re: Is it normal to have CYA level drop?

    Thanks, ill keep an eye out. Can i test cya while slamming?
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Mod Squad pooldv's Avatar
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    Re: Is it normal to have CYA level drop?

    Yes. PH is the only test that doesn't work with high FC.
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