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Thread: Question on Free Chlorine.

  1. Back To Top    #1

    Join Date
    May 2016
    Location
    Gahanna
    Posts
    2

    Question on Free Chlorine.

    Was inputting numbers on the pool math calculator. My CYA is 0, but something happened and it defaulted to 70. So slamming my pool it said I needed to take FC to 28. I added the 7 gallons of bleach, and then an hour later I figured It out. At 0 CYA, only need 10 FC to get to shock level. Will this mess anything up? Retested and FC is at 25 now.



    20,500 gallon inground vinyl pool. 16x32 oval
    Pentair Intellichlor IC40
    Taglus Sand filter
    Hayward Super Pump VS

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Question on Free Chlorine.

    Quote Originally Posted by Martyg14 View Post
    Was inputting numbers on the pool math calculator. My CYA is 0, but something happened and it defaulted to 7. So slamming my pool it said I needed to take FC to 28. I added the 7 gallons of bleach, and then an hour later I figured It out. At 0 CYA, only need 10 FC to get to shock level. Will this mess anything up? Retested and FC is at 25 now.



    Sent from my SM-T320 using Tapatalk
    If you have a vinyl liner, it could bleach it. If your pool is plaster, probably nothing will happen. Take a few minutes to fill out your signature, okay?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3

    Join Date
    May 2016
    Location
    Gahanna
    Posts
    2

    Re: Question on Free Chlorine.

    Thanks Richard, liner is old and faded anyway. I updated signature. The liner came out of the track over last winter and did it again this winter. Luckily it's in the shallow end. Needed to drain the shallow end to get it back in last spring. Will need to do the same thing this spring. I just hate to replace it until I absolutely have to. No leaks and hopefully no tears after I refill it again.
    20,500 gallon inground vinyl pool. 16x32 oval
    Pentair Intellichlor IC40
    Taglus Sand filter
    Hayward Super Pump VS

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