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Thread: Post Balancing after Algae fight is driving me nuts.

  1. Back To Top    #1

    Join Date
    May 2013
    Twin Lakes Wi

    Post Balancing after Algae fight is driving me nuts.

    Hi All,
    I followed the instructions to kill off the algae in my pool. Very successful.

    After 3 days the pool is very clear, looks great.

    My test numbers are making my head spin...

    FC 7.0 - This is expected as FC was very high to fight Algae
    CC < .5
    Ph 7.0 - This is low, so I know I need to raise it
    Alk 140 - This is high so I know I need to lower it
    CYA 0 - This is very low, so I know I need to raise it

    I read all the pool school articles. I am just not sure what my priority should be with these numbers.

    Using the pool calculator I could put Ph down in to lower my Alk to 120, but this would lower Ph too, I need to raise my Ph.
    I don't have a steady Ph raise, nor high calcium so maybe lowering Alk of 140 shouldn't be my priority.

    I need to raise CYA, maybe using dichlor over 4 days as pool school suggests.
    I have some trichlor tabs on hand (2) It may take longer but maybe just adding them to a floater will help.
    The pool gets direct sunlight about 4 hrs a day, and I use a solar cover.

    Thanks in advance
    24Ft Round 16k Gal, AG, Hayward DE 50AC, 2.0HP Pump, 2004.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Post Balancing after Algae fight is driving me nuts.

    You should raise your CYA level fairly quickly. Right now you are losing chlorine fairly rapidly to sunlight, and you want that to stop soon.

    You should probably raise the PH just a little. The PH will drift up on it's own, so long term you will be fine. However, raising CYA will lower PH and you are already a little too low, so raise PH to 7.2 or perhaps 7.4. After that let it come up the rest of the way on it's own.
    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

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Post Balancing after Algae fight is driving me nuts.

    I would recommend you not use dichlor to raise CYA...just use CYA. It is much easier to control one parameter at a time rather than three or four using dichlor.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Apr 2012
    SW Ohio

    Re: Post Balancing after Algae fight is driving me nuts.

    Also the pucks are very acidic and will lower your pH while you are trying to raise your cya. I would use powdered cya to raise it.......Mike
    18x52 intex ultra frame pool 6981 gallons, 1 HP LL pump with 19 in sand filter,BBB method,borax 50ppm
    leslies DPD test kit + fas-dpd chlorine test kit + borates test strips
    thru wall skimmer,hard plumbed with 2 returns 1 1/2 sch 40 pvc
    1 large fountain 1 inch sch 40 pvc,shut off ball valves on all

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