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Thread: Question about balancing water

  1. Back To Top    #1

    Join Date
    Feb 2015
    Location
    North Alabama
    Posts
    58

    Question about balancing water

    We opened the pool 5 days ago. Water was dark green. Followed SLAM process for a few days and kept pump running 24 hrs. Water is now pretty clear with some pollen settled around the bottom (not crystal clear, but can easily see bottom of deep end). Turned on SWG yesterday and set to "super chlorinate" for about a day, then switched to 50% today. My plan was to switch to timer mode after today and only run for 8 or 9 hours per day.

    However, I tested FC tonight after sundown using the FAS/DPD drop test. FC was only 1. CC was .5. I know my stabilizer is low...I am going to buy some tomorrow and add asap.

    So, my question....is the low CYA the reason the FC is disappearing? Or, if organic material in the water is causing it, would that mean I need to SLAM again? Last year all season I could operate the SWG less than 50% (running pump 8-10 hours/day) and never had a problem.

    Also, what exactly does CC of .5 indicate?

    FC 1
    CC .5
    pH 7.5
    CYA ~10
    Calc ~30
    TA 95
    Water temp ~63
    Pool gets full sun from about 9 am - 3pm.
    saltwater generator - Hayward turbo cell
    Whisperflo multiport valve sand filter
    25,000 gallon vinyl pool (20x40 rectangular)
    Polaris 280
    TF-100 test kit

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    northrn's Avatar
    Join Date
    May 2014
    Location
    Cincinnati, OH
    Posts
    532

    Re: Question about balancing water

    wal, if your water really isn't as clear as Waterford crystal, I would think maybe the SLAM isn't quite done. But a good way to check that would be to perform an OCLT. turn the SWG off. Raise your chlorine to SLAM level. Test again at dark and just before daylight. If you have a loss > 1 ppm then you need to continue the SLAM.

    You're gonna lose chlorine to the sun and to organics. this way you can find out which way it's going.
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Question about balancing water

    The majority of what you're losing is probably the low CYA. The remainder is organics. Don't neglect to check ladders and lights for hidden algae.

    The .5 CC just means there are still organics somewhere in the water reacting with the FC.

    Take the CYA up to 30 and just assume it's all there even though it won't have all dissolved and get FC up to 12. Then using bleach and the SWG, keep FC at 12.
    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!

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    Join Date
    Feb 2015
    Location
    North Alabama
    Posts
    58

    Re: Question about balancing water

    Thank you! Do you suggest relying on bleach to get to 12 or using the SWG at 100? Is it ok to leave the SWG on while adding bleach? Keep FC at 12 until it passes the OCLT?

    Also, should I keep the pump running continuously, or can I turn it off at night once it passes the OCLT?
    saltwater generator - Hayward turbo cell
    Whisperflo multiport valve sand filter
    25,000 gallon vinyl pool (20x40 rectangular)
    Polaris 280
    TF-100 test kit

  5. Back To Top    #5

    Join Date
    Aug 2014
    Location
    Northern IL
    Posts
    4,615

    Re: Question about balancing water

    Use bleach. Some people do leave their SWG's on during a slam, but usually only if they can't baby-sit the pool. Try never to run the SWG at 100%. It will shorten the life of your cell. When it comes time for the OCLT, make sure the SWG is off. After a successful OCLT, no need to run the pump 24/7.

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