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Thread: Help with chemistry

  1. Back To Top    #1

    Help with chemistry

    Any help is appreciated...this is my first pool and it's a bit overwhelming!
    To the best of my ability to assume a volume, I come up with ~27000 gallons
    18' wide X 37' long -- 8-1/2' deep X 3-1/2' shallow = 6' average
    Salt Water with new chlorinator
    new Unicel filters - 420 in.

    Here are my test results from Leslie's
    6/1/2011
    TAC - .5
    pH - 8.0
    TA - 200
    CYA - 30
    CH - 230
    TDS - 5000
    Phos - 200
    Suggested adding 4 gallons Muriatic Acid - 1 qt every 4 hours to lower pH and TA

    6/5/2011
    FAC - 4
    pH - 7.6
    TA - 230
    CYA - 0
    CH - 240
    Salt - 3700
    Phos - 0
    Suggested adding 2 more gallons Muriatic Acid - 1 pint every 4 hours to lower TA
    Also 5 lbs conditioner in a sock placed in a skimmer basket to raise CYA

    Can my CYA reduce from 30 to 0 in 5 days on its own with no rain or water added to pool?
    Seems like I'm adding a lot of Muriatic Acid? is this normal? doesn't seem to be helping anything but pH.

    Thanks in advance for your help, not only with my issue but with the entire site, it's a great tool!

    Cheers!

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    Re: Help with chemistry

    Welcome to TFP!

    What kind of pool is it: plaster, vinyl, fiberglass? Rapid PH increases are very common with fresh plaster. Expect to add acid every day for the first three or four weeks with fresh plaster.

    CYA did not go down by 30, no way. Their testing is simply not accurate. You will have much more consistent results if you get your own top quality test kit. I recommend the TF100 from TFTestKits.net. The Taylor K-2006 is also good.
    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

    Re: Help with chemistry

    Pool is gunnite? plaster? but it's 2008 model.
    i didn't close the pool over the winter (Edmond, Oklahoma) and we had quite a bit of snow and normal amounts of rain.
    i kept a 3" chlorine tablet in the skimmers all winter and the pool ran 5 hours/night.
    I will try another gallon of acid and see where it is.
    I think I need to get pH and Alk. lined out then worry about the CYA & Chlorine.

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Help with chemistry

    Alright, then the rapid PH increase is coming from the high TA level. Keep lowering PH to 7.2 every time it gets to 7.8 and the TA will come down slowly.

    You might also want to check the TA level of your fill water. It may be that TA is going up every time you add water to the 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: Help with chemistry

    Excellent point. I'm on well water and the water I fill with is straight out of the ground!
    I bet you just solved my issue!

    Thanks again, I appreciate it.

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