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Thread: Filling with VERY basic water.

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    jmills's Avatar
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    Filling with VERY basic water.

    Hi Folks,

    I am heading into my third year with a pool. Half way through the first year this forum saved me. Last year was BBB with no problems.

    I am filling the pool now, but the water I am using is very different than last year. The tap water is PH 8.6 or higher according to the various test kits we have. The TA is 50. I am assuming that the CYA of my tap water is 0. I have already added bleach to avoid biological problems.

    I am used to starting with acidic water. What should I do to this water?
    12' x 20' Intex Oval Frame Pool, AG
    Waterway 1 hp TWM Cartridge Filter
    4' x 20' solar panel
    41' water depth
    4393 Gallons according to the box.

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    Mod Squad JohnT's Avatar
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    Re: Filling with VERY basic water.

    What kind of test kits? Most pool kits don't measure above 8.4, and the commonly used ones only go to 8.2. Are you just estimating from the existing scale? Are you testing the pH after adding chlorine?

    You won't have any CYA in the tap water.

    Far and away the best way to deal with the pH is muriatic acid.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    jmills's Avatar
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    Re: Filling with VERY basic water.

    I have used two of the Taylor test kits that top off at 8.2 and my wife's fish tank kit that tops off at 8.6.

    This is as the water comes out of the tap.

    JLM
    12' x 20' Intex Oval Frame Pool, AG
    Waterway 1 hp TWM Cartridge Filter
    4' x 20' solar panel
    41' water depth
    4393 Gallons according to the box.

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    Re: Filling with VERY basic water.

    Simple solution, use acid to lower the pH then, once the pH is where you want it use baking soda to bring up the TA. Make sure that the chlorine levels are below 10 ppm (if using a Taylor kit) when you do this. If your Taylor kit has an acid demand test I would use that since your pH will move quickly with that low a TA.
    Which Taylor kits do you have?

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    jmills's Avatar
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    Re: Filling with VERY basic water.

    I have a Talylor/Leslie's Deluxe DPD 18-547 kit. This does Free and Total Cl using reagents R-0001, R-0002, and R-0003. It does PH with R-0014 and you add R-0015 to that for acid demand. It does TA using R-007, R-008, and R-0009. I also have a TF-100.

    When I measured the PH again today using the Taylor R-0014, it was more purple than the top 8.2 window. When I added ONE drop of R-0015 for the Acid Demand Test the color changed to more yellow than the bottom 6.8 window. The chart on the kit says I should use 4 oz of 20 Baume Muriatic Acid if one drop gives the desired results, but that is probably too much.

    The Pool Calculator says to go from pH 8.2 to 7.8 I should add 2.1 oz of 20 Baume Acid.

    I bought the acid, but I haven't used it yet. Things got more complicated today by partially breaking a fitting in the filter plumbing. It's not leaking much right now, but it might not hold if I turn the pump on and pressurize the system. This makes it hard to mix the water. I should get a new part by Friday. Nothing too bad should happen as long as I keep adding bleach.
    12' x 20' Intex Oval Frame Pool, AG
    Waterway 1 hp TWM Cartridge Filter
    4' x 20' solar panel
    41' water depth
    4393 Gallons according to the box.

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    JasonLion's Avatar
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    Re: Filling with VERY basic water.

    The TA is probably very very low, so the PH is really easy to change. If so, it shouldn't pose much of a problem.

    If you post a set of test results we can advise you better.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Filling with VERY basic water.

    Quote Originally Posted by JasonLion
    The TA is probably very very low, so the PH is really easy to change. If so, it shouldn't pose much of a problem.

    If you post a set of test results we can advise you better.
    It is
    Quote Originally Posted by jmills
    The TA is 50.

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