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Thread: Chlorine useage based on cya level ?

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    Chlorine useage based on cya level ?

    My cya is about 60 and my chlorine range is 5-9. I use about 3 ppm a day and and 4.5cups a day to bring it back up. Left town Friday night and brought my pool up to shock level of 18. Figured when i returned Sunday night i would find a Chlorine level of 12. Returned and tested chlorine level and it was 8.5.

    So my question is, if outside of your recommended chlorine range does your cya loose its ability to buffer your chlorine loss? Will i loose chlorine at a faster rate during the day when it is above 9 versus when it is between 5-9?

    I also had a lot of rain so i am sure some of my loss was due to dilution. I had to drain several inches of water.

    Thanks
    Kidney shaped ~ 10000 gallon Ig Plaster pool with pool cage. 120sf Cartridge filter. Pentair WhisperFlo WFDS-26, 230 Volt, 7.8/3.0 Amp, 1-1/2 Horsepower 2 speed pump, Solar panels on the roof. Heliotrope HelioMatic 4000D solar controller.

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    frustratedpoolmom's Avatar
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    Re: Chlorine useage based on cya level ?

    Yes, and that sounds normal to me especially if the pool was left uncovered. Did you use a solar cover? Using a solar cover while your gone will slow down the loss significantly.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    JasonLion's Avatar
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    Re: Chlorine useage based on cya level ?

    Chlorine lost to sunlight goes as a percentage of the FC level. With CYA around 60 you are losing about 1/3 of your FC each day, not 3 ppm/day. That means that when FC is 18 you lose 6 ppm the first day (approximately).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Chlorine useage based on cya level ?

    Quote Originally Posted by JasonLion
    Chlorine lost to sunlight goes as a percentage of the FC level. With CYA around 60 you are losing about 1/3 of your FC each day, not 3 ppm/day. That means that when FC is 18 you lose 6 ppm the first day (approximately).
    Well that makes perfect sense. With it at 9 I loose 3 which leaves me at 6 under normal levels.
    Kidney shaped ~ 10000 gallon Ig Plaster pool with pool cage. 120sf Cartridge filter. Pentair WhisperFlo WFDS-26, 230 Volt, 7.8/3.0 Amp, 1-1/2 Horsepower 2 speed pump, Solar panels on the roof. Heliotrope HelioMatic 4000D solar controller.

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