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Thread: Should I raise my cya?

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    Should I raise my cya?

    I started off the swim season this spring with a cya of 80. I was going to drain it partially because my CH was at around 750...but then the rains came. Now my CH is around 450 (yay) but my CYA is around 25 (boo). I was on vacation for two weeks and had a little algae when I came home, so I'm slamming right now. I love that with a low cya, my chlorine SLAM level is around 11. Much cheaper to require less chlorine!

    Now I have to decide if I should add cya or just leave it low and enjoy adding less bleach and keeping chlorine at 4ppm. It's full sun from 12pm-8 pm and I have 3 kids and their friends swimming here. Would you try I raise the cya? If so, would you buy pucks or would you buy powdered stabilizer from the pool store? Or can I maintain a sparkly pool with a cya if 25? I test chlorine and pH daily.
    17,000 inground gunite pool finished June 2013. Pentair variable speed something or another. Polaris cleaner, inline rainbow chlorinator. Using trichlor until CYA reaches 50-60.

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    pwrstrk's Avatar
    Join Date
    Aug 2012
    Elverson Pa.

    Should I raise my cya?

    I would raise the CYA to 40 after the SLAM is over. You'll get better protection from the sun at that level. Yes your FC level will be higher but better protection from the sun.
    If you take it to 40, 3 will be the min FC and I would target 7. That will give you wiggle room for FC burn off so you don't fall below your min.
    I would just buy the stabilizer rather than going the puck route. 😎
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Join Date
    Oct 2013
    Chapin, SC

    Re: Should I raise my cya?

    In my experience, rains can't account for a 45 ppm decrease in cya. Just wondering?
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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    Join Date
    Sep 2009
    Greentown, IN

    Re: Should I raise my cya?

    Rain shouldn't account for that kind of CYA loss unless you had to drain some water due to the amount of rain. I would check your CYA again to be sure your last reading was accurate.

    Also, keeping your CYA level up a bit does raise your addition of chlorine a bit but also gives you more protection from the sun & in so helping to minimize that extra chlorine you thought you were using. If you keep your pool in the correct FC range, you shouldn't ever have to SLAM.
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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