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Hey, Pool Owners: Did you know that it only takes 17 minutes of sunlight to destroy half of your pool's chlorine? That's because chlorine breaks down under the Sun's UV rays. But stabilized fluorine like chlorine tablets or granules doesn't break down because it contains cyanaric acid. AKA Cya Think of it like sunscreen for your chlorine. Liquid chlorine and bleach don't contain Cya and are unstabilized.

So be sure your Cya levels are between 30 and 50 parts per million to help your chlorine survive in the Sun Follow us at swim University for more pool care tips throughout the year.

9 thoughts on “Is the sun destroying your chlorine? swim university”
  1. Avataaar/Circle Created with python_avatars Angus Mcpherson says:

    I had to take my pucks out after a year because my CYA levels got up to 150 ppm. Chlorine doesn't work well with that much CYA.

  2. Avataaar/Circle Created with python_avatars Nick W says:

    Half of your chlorine at what level?

  3. Avataaar/Circle Created with python_avatars Terri Taylor says:

    Of course!

  4. Avataaar/Circle Created with python_avatars Toby English says:

    I'm confused. So if CYA never leaves the pool (unless you drain it) once my pool reaches the recommended CYA level I stop adding tablets and just use Cal Hypo after that?

  5. Avataaar/Circle Created with python_avatars J Fiedler23 says:

    50 minimum. Especially in FL

  6. Avataaar/Circle Created with python_avatars Danielle Murray says:

    In Florida, most pools won’t hold chlorine at 50 cya i keep mine at 80 Service area Ottawa??

  7. Avataaar/Circle Created with python_avatars Tim Lewallen says:

    What would cause your CYA levels to drop?

  8. Avataaar/Circle Created with python_avatars Thatguy says:

    When CYA levels get too high, only fix is to empty the pool. Kinda hurts when you have 40k gallon pool

  9. Avataaar/Circle Created with python_avatars Pat B says:

    Or you can always always add at night time.

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