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Thread: Help with all numbers!

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    Help with all numbers!

    Happy Easter everyone! I'm working on my pool today which has never been properly balanced. I need help mainly with the order to do things.
    I need to Slam but can't maintain the FC due to 0 Cya created mainly from flooding here. I have purchased the Cya and will add that today so that my chlorine will hold better. Here are my other problems :
    PH: 6.8
    TA: 20
    After entering all info in the calculator, I'm advised to add Borax, Baking soda, and stabilizer. In what order do these need to be added and should they be spaced out? Is correcting one potentially going to raise or lower the other? Am I correct to think CYA first so my chlorine will hold? Also do I add CYA in a sock in front of return or inside skimmer basket? Again, thanks so very much for helping this new pool owner!
    16 x 32 inground 23000-gallon, 4 ft shallow going to 8 ft deep, concrete surround, Hayward Pro Series High Rate Sand Filter (Side Valve) with new valve and sand, New Hayward Super Pump, Inline chlorine tab feeder (not using) TF-100xl test kit

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    Patrick_B's Avatar
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    Re: Help with all numbers!

    Either way adding Cya is fine, but get that started. Don't add the borates yet, or maybe ever as those are optional.

    Next If you're sure of the TA of 20, you'll need the baking soda. It may raise your pH a touch, but not enough to interfere with the SLAM. No special order to follow or worry adding any of these one after the other in your situation.
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    Mod Squad pooldv's Avatar
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    Re: Help with all numbers!

    Yes, add 30ppm of CYA in a sock. Use soda ash to raise your TA and it will also raise your PH. Raise your TA to about 60 and your PH to 7.2 prior to the SLAM. Your PH is possibly lower than 6.8 so mix the pool water for 30 minutes and test again until it holds at 7.2. Take the TA up to maybe 40 the first time and then retest in 30 minutes and dose again to 60. When PH and TA is extremely low, as it is now, the recommended numbers in Poolmath are not as accurate. PH is measured in an algorithmic scale and the farther your get from center the greater the separation.

    Read this page on pool chemicals on what they are and how to add them, Pool School - Recommended Pool Chemicals
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    Re: Help with all numbers!

    Now I'm confused.. The pool calculator says baking soda to raise Ta. How do I calculate how much soda ash instead?

    16 x 32 inground 23000-gallon, 4 ft shallow going to 8 ft deep, concrete surround, Hayward Pro Series High Rate Sand Filter (Side Valve) with new valve and sand, New Hayward Super Pump, Inline chlorine tab feeder (not using) TF-100xl test kit

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    Mod Squad pooldv's Avatar
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    Re: Help with all numbers!

    It gives you the soda ash info under PH. And you can look a little lower in effects of adding chemicals and enter different amounts of soda ash and it will tell you how much it will raise PH and TA.
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    Re: Help with all numbers!

    baking soda will do the same exact thing and you probably already have that that is the wonderful thing about TFP, we give you many ways to do things
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    Patrick_B's Avatar
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    Re: Help with all numbers!

    My apologies, I wasn't thinking about you being below 6.8.

    DV is right, your pH may be below 6.8. So get "pH up" at the pool section, or pool store...or Washing Soda in the Laundry Isle. Both of these are Soda Ash. Add it until the pH is 7.2. Add in increments according to Pool Math starting with 6.8 pH.

    You'll likely have to add more times until it's right.
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    Re: Help with all numbers!

    Ok.. Thanks so much. After adding the soda ash or ph up, how long before I test to get a good reading to know where to go from there?

    16 x 32 inground 23000-gallon, 4 ft shallow going to 8 ft deep, concrete surround, Hayward Pro Series High Rate Sand Filter (Side Valve) with new valve and sand, New Hayward Super Pump, Inline chlorine tab feeder (not using) TF-100xl test kit

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    Texas Splash's Avatar
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    Re: Help with all numbers!

    Test again after about 15-20 minutes with the pump running. Should be good.
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    Patrick_B's Avatar
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    Re: Help with all numbers!

    Using Soda Ash to increase the pH will bring the TA up as well, so don't worry about having to adjust it too.

    It will be taken care of well enough for the SLAM just by doing this for the pH increase. Once you are done with the SLAM, you can worry about checking TA again then.
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