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Thread: Help re balancing pool chemistry

  1. Back To Top    #1

    Join Date
    Apr 2011
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    Pensacola, Florida
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    Help re balancing pool chemistry

    The weather has gotten warm and the pool is now up to 80 degrees. We keep the pool open all year even though we don't use it in the cool months. We've had a good bit of rain and now the chemistry, which stayed perfect all winter, has gotten out of whack. The pool is in direct sun from about 9AM until sundown. Here are the current readings.

    FC 1 (Added chlorine after this test)
    TC 1
    pH 8.2 (high) up from a constant winter reading of 7.8
    TA 110 (high) up from a constant winter reading of 80
    CH 140 dropped due to rainfall
    CYA 40 down from 50 last month

    The pool seems to be using a good bit of chlorine so I'm assuming that's because the CYA is low since it is in direct sunlight. I also need to bring down the pH and TA. What sequence should I follow to correct these numbers?
    Can trichlor pucks be used to bring up the cya.
    Pool: 18,000 gallons, Cartridge filter, In ground vinyl, Polaris pool cleaner

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    linen's Avatar
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    Jul 2010
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    Re: Help re balancing pool chemistry

    Hey jimcam22

    How does your water look? Have you tested your CC level?

    Quote Originally Posted by jimcam22
    FC 1 (Added chlorine after this test)
    How much did you raise it?

    Quote Originally Posted by jimcam22
    pH 8.2 (high) up from a constant winter reading of 7.8
    That is high. I would lower to 7.4.

    Quote Originally Posted by jimcam22
    TA 110 (high) up from a constant winter reading of 80
    That is not too bad, lower your ph a few times when it rises will probably fix the TA. Do you have an autofill and what is your fill water TA?

    Quote Originally Posted by jimcam22
    CYA 40 down from 50 last month
    Not to bad, but it sounds like you have had better luck with higher CYA. If you are loosing more than 3-4 ppm during the day it might make sense to bump it back up to 50.

    Quote Originally Posted by jimcam22
    I also need to bring down the pH and TA.
    Definetly bring down the ph, but like I mentioned above, you may find that doing a couple of cycles brings your TA down "naturally".
    Quote Originally Posted by jimcam22
    What sequence should I follow to correct these numbers?
    ph first, then 1/2 hour later, up the FC. CYA can be done in parallel.
    Quote Originally Posted by jimcam22
    Can trichlor pucks be used to bring up the cya.
    Yes, and they will also (slowly) lower ph. I think you know this, but be careful how much you use since once CYA is high you have to drain and refill. Your ph is high enough that you should lower it with MA and not wait for the trichlor to do it.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  3. Back To Top    #3
    JasonLion's Avatar
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    May 2007
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    Re: Help re balancing pool chemistry

    Bring the PH down to 7.8 (or a bit lower) right away (first). That will lower the TA a little, probably enough that you don't need to worry about TA further just at the moment.
    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

  4. Back To Top    #4

    Join Date
    Apr 2011
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    Pensacola, Florida
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    Re: Help re balancing pool chemistry

    Thanks for the quick answer. I thought the pH should be my main concern but thought I would check. I'll work on lowering it right away with MA. My CC is 0 and the water is clear and sparkling. I brought the FC up to 3 so I can test it tomorrow and see how much burned off today. Then I'll tackle the cya if needed.
    Pool: 18,000 gallons, Cartridge filter, In ground vinyl, Polaris pool cleaner

  5. Back To Top    #5
    linen's Avatar
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    Re: Help re balancing pool chemistry

    That sounds like a good plan, let us know how it goes.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  6. Back To Top    #6

    Join Date
    Apr 2011
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    Pensacola, Florida
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    Re: Help re balancing pool chemistry

    All is well with the pool chemistry. I brought the pH down to 7.8. Then we had three days of rain. The TA is down to 90.
    The cya is at 30 but the chlorine does not seem to be burning off to fast. I think I had chlorine that had deteriorated over the winter and I just thought it was burning off. Thanks for the help.
    Pool: 18,000 gallons, Cartridge filter, In ground vinyl, Polaris pool cleaner

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