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Thread: cyanuric acid level

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    cyanuric acid level

    Hello, I was in the pool store over the weekend and I heard one of the employees telling a customer that cyanuric acid never changes once it is in the water. I am relatively new to pools but I have browsed through many of the posts here on this forum and the posts on I have concluded that cyanuric acid does 'burn off' over time. Is this correct? Thanks in advance.

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    Mod Squad JohnT's Avatar
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    Apr 2007
    SW Indiana
    CYA seldom goes away on its own. Dilution by rainwater tends to lower it, but it doesn't just go away.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    I believe some pools see a drop in CYA over the winter, and the proposed cause is organics in the water that consume the CYA, since the pool is not being sanitized. But for the summer, most do not see a drop in CYA unless they have to backwash to waste, have a leak, or drain some water.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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