Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Trying to figure out why we can't keep chlorine levels up...

  1. Back To Top    #1

    Trying to figure out why we can't keep chlorine levels up...

    I have read the pool school and have been looking at the CYA/Chlorine chart but admit I'm a bit confused. We have an above ground that is about 12,000 gallons. The pool is crystal clear but has a strong odor. From my reading, I'm pretty sure we are dealing with an issue of too much Combined Chlorine but am not sure how to get it down. Here are the numbers from the test I just ran:
    FC: .5
    TC: .5
    PH: 7.5
    CYA: 50
    ALK: 80

    My husband has been using 6% bleach from Walmart, adding it at night. We get high readings until about mid-day the following day when it drops. Any direction you could give me would be greatly appreciated!

  2. Back To Top    #2

    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
    Posts
    220

    Re: Trying to figure out why we can't keep chlorine levels up...

    Try shocking your pool. Seems I've read here that's the way to get rid of your CC.
    20x40 30,000 gal IG Liner, Pentair II Sand

  3. Back To Top    #3

    Re: Trying to figure out why we can't keep chlorine levels up...

    Thanks for the reply. We have been using quite a bit of the bleach and I imagine we are just not using enough. We used the Pool Calculator and added bleach as instructed and still have the same problem the following day with the readings dropping very low.

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Trying to figure out why we can't keep chlorine levels up...

    How much bleach? For a CYA of 50, shock level is around 16. To raise FC by 16 in a 12,000 gallon pool requires just over 3 gallons of bleach. To properly shock the pool may require doing that several times in fairly rapid succession. See this article for more information on the proper way to shock a pool.
    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

  5. Back To Top    #5

    Re: Trying to figure out why we can't keep chlorine levels up...

    We have added the bleach that the calculator suggested but I guess we just aren't doing it over and over again. We generally wait until the following night. We'll try to do it in rapid succession to keep the numbers up. Thank you!

  6. Back To Top    #6

    Join Date
    Jul 2007
    Location
    Waterford Michigan
    Posts
    36

    Re: Trying to figure out why we can't keep chlorine levels up...

    Keep at it. If you don't check the water in the morning you go a whole day with a low FCL level . You need to keep shock level up over night.( 0.5 drop or less) to ensure you end with sparkling water.
    15x30 AG
    Cartridge Filter
    Solar Heater
    1.0 HP 2 Speed pump
    + 2 KIDS

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •