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Thread: zero TA acid bath

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    Join Date
    Oct 2014
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    Welkom / Freestate
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    zero TA acid bath

    What will be the best way to get TA and Ph to the corrct level after the acid bath. Will the TDS go up because of the desolved calsium during the process

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    JasonLion's Avatar
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    Re: zero TA acid bath

    Welcome to TFP!

    When raising PH from very very low values it is generally best to use borax, however you can use soda ash if you need to. Either way the TA is likely to come out a little higher than we recommend. Measure TA after the PH is where you want it to be and adjust if needed.

    TDS is not an interesting number. It is best to completely ignore TDS, and concentrate on the numbers that matter, like the CH and CYA levels.

    Very low PH will cause calcium to be etched off of plaster surfaces and go into the water, raising the CH level in the water. You need to be careful when doing a no drain acid wash to be sure CH doesn't end up too high, or you can have calcium scaling when you raise the PH/TA back up. In situations where you need to remove a lot of calcium, you may need to do water replacement to get CH levels down before raising PH all the way back up, but do raise PH at least part way to stop the acid wash before replacing water.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: zero TA acid bath

    Thanks Jason for your rapit responce.ijust want to give you some values and more info . Ilive in SA and we realy have harch weather in the Freestate , hard to keep pool clean with the dust storms.my pool was build by myself some 22 years ago and just after the marblelite was put on we had a bad dust storm so the appearance from start wasn't good .over the years their war a heavy buildup of calcium and debre stains .the pool is 60 -65 KL before the acid bath the TA was 180 and th PH 7.2 it took. 60 litre acid 33% to lower to 0 or a bit below TA .how many water must I replace and to what ph and ta must I adjust before letting water out .

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    JasonLion's Avatar
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    Re: zero TA acid bath

    You can't know how much water to replace until you measure the CH levels. Raise the PH to around 6.6 to 7.0 and then measure the CH level and see where things are before continuing.
    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

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    Re: zero TA acid bath

    I will do so , thanks

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