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Thread: BBB / CYA with intense sunlight

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    BBB / CYA with intense sunlight

    The last few years, I've chlorinated my pool with bleach and ran a CYA level around 75 due to the fact the I live in sunny Phoenix, AZ.

    However, in the summer months I still have a problem: Every night, I put in the bleach after sunset. Because of the high CYA level, I have to put in A LOT of bleach to get the FC level up to the recommended value. BUT, despite the high CYA level, it is so sunny and hot here that by the next evening my FC is darn near zero again.

    Next month I am having my water treated with reverse osmosis to remove calcium. This will remove the CYA, too. Therefore, I am contemplating going with a near zero level of CYA. This will allow me to raise the FC level every evening with a much lower amount of bleach. And, since the FC level will be near zero the next evening with or without CYA, I'll be able to get by with adding much less bleach.

    Anyone tried this?
    40,000 gal glass tile with BBB chemistry
    Dual Pentair cartridge filters
    Scottsdale, AZ

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    pwrstrk's Avatar
    Join Date
    Aug 2012
    Elverson Pa.

    Re: BBB / CYA with intense sunlight

    It seems to me with zero or close to zero cya the sun will burn the chlorine up much quicker. Somebody else will know for sure.

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: BBB / CYA with intense sunlight

    Gotta be something else besides just sunshine eating up THAT much chlorine per day with CYA @ 75 and losing almost 9ppm of FC per day.
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    JasonLion's Avatar
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    May 2007
    Silver Spring, MD

    Re: BBB / CYA with intense sunlight

    You have algae or some other organic contamination. With CYA that high FC usage would be around 1, maybe 2 ppm per day if everything was working correctly. With high CYA levels it is quite possible to have a low level algae problem, where you can't see anything but there is still algae. You need to shock the pool.
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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: BBB / CYA with intense sunlight

    I agree with Jason. The quick confirmation would be to perform the OCLT. Likely then followed by the shock process.

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    Jason, TFP Moderator
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    Re: BBB / CYA with intense sunlight

    OK. I will do the overnight test.
    40,000 gal glass tile with BBB chemistry
    Dual Pentair cartridge filters
    Scottsdale, AZ

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