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Thread: question after acid washing

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    question after acid washing

    Hi

    so I just emptied my pool and acid washed it. I couldn't find any info on the process for adding chemicals after refilling. I have a swg. Do I just follow directions for a new pool with new plaster or should I perhaps do something a little different? Thanks for all your help in advance.
    Omar
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    Re: question after acid washing

    The plaster is fully cured and won't need to be treated like new plaster. I would get the pH and alkalinity right first. Then start bringing up the chlorine. Then add cyanuric, salt and calcium as needed. Keep the SWG off until you get a good balance.

    If you can post fill water test results, we can give more specific advice.

    Edit- Although the plaster should be fully cured, the acid wash might have exposed some calcium hydroxide in the underlying cement. Allowing the hydroxide to get converted into carbonate before adding salt might be worthwhile. If you want to be extra cautious, you could wait a few weeks before adding salt. -End edit.

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    Re: question after acid washing

    Your primary goal as you start to fill is to completely test your water chemistry so you will know what, if any, adjustments you need to make.
    Dave S.
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    Re: question after acid washing

    thanks. I will start testing. It has been 2 days and still filling.
    Omar
    42' x 25' Gunite Pool, 10' x 10' Spa, Horseshoe wading pool around spa, 40,000 gallons
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    Re: question after acid washing

    Also, when should start adding borates?
    Omar
    42' x 25' Gunite Pool, 10' x 10' Spa, Horseshoe wading pool around spa, 40,000 gallons
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    Re: question after acid washing

    Quote Originally Posted by omsrex View Post
    Also, when should start adding borates?
    After you have everything else balanced and running smoothly. That's a secondary chemical and should only be added after all the other parameters are met and balanced.
    Dave J. TFP Moderator
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    Mod Squad jblizzle's Avatar
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    Re: question after acid washing

    Also realize that borates are completely optional and most people do not use them.
    Jason, TFP Moderator
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    Re: question after acid washing

    Ok so I tested the water yesterday at 5PM

    Ph 7.2
    FC 0.2
    TA 65
    CH 90
    CYA did not check since I just added some and know it take a week to register

    I then added 1.5 gallons of 8.25 bleach this morning and 240lbs of salt

    what do you guys think?
    Omar
    42' x 25' Gunite Pool, 10' x 10' Spa, Horseshoe wading pool around spa, 40,000 gallons
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    Mod Squad jblizzle's Avatar
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    Re: question after acid washing

    I guess you did not care for James suggestion on waiting before adding salt ....

    You CH is much too low, but with the addition of the bleach, the rest looks OK.

    What was your CYA target? Use that to determine your required FC level.
    Jason, TFP Moderator
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    Re: question after acid washing

    Opps. I missed that salt recommendation. For cya I guess it be 80 for swg, right?
    Omar
    42' x 25' Gunite Pool, 10' x 10' Spa, Horseshoe wading pool around spa, 40,000 gallons
    Hayward Aquarite SWG, Pentair IntelliFlo VS Pump 3HP(main) 011018
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    Mod Squad jblizzle's Avatar
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    Re: question after acid washing

    Ultimately you want it in the 70-80ppm range, although it is usually a good idea to not try to do it all at once. For example, if I was starting with a fresh fill and have a SWG, I might target 50ppm with the initial dose and check it after a week and then calculate a new dose ... you do not want to overshoot.

    So, how much CYA did you add? What was the CYA you were targeting? That is what should determine your FC level until you retest the CYA.
    Jason, TFP Moderator
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    Re: question after acid washing

    I put in 16lbs of cya. I was targeting 70ish. But that seems like a good idea. I should probably wait another week or 2 and test again so I don't overshoot. I have also spoken to some people in my area. they tell me that the CH is usually high since we have hard water in el paso, tx. Mine is 90ppm from the fesh fill. I am wondering if that is true then why would mine be so low. I also remember that last year it was usually around 300ppm and i never added any calcium to the pool. I wonder if the calcium is leaching from the plaster. DO you think I should wait and let it stabilze or add some calcium? My plaster was pretty rough when I emptied it to acid wash it, so we actually sanded it smooth. thanks
    sorry for long and winded statement/question.
    Omar
    42' x 25' Gunite Pool, 10' x 10' Spa, Horseshoe wading pool around spa, 40,000 gallons
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    Mod Squad jblizzle's Avatar
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    Re: question after acid washing

    You are lucky that you water appears to be softer ... not uncommon. The CH will continually rise as water evaporates out (leaving its CH) and you add more water with new CH. But currently you CH is much too low for a plaster pool and could be damaging. I would get it up to at least 200ppm and keep the pH a little higher so the water is less aggressive.
    Jason, TFP Moderator
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    Re: question after acid washing

    So add CaCl or CaCl dihydrate? is there a difference between the 2?
    Omar
    42' x 25' Gunite Pool, 10' x 10' Spa, Horseshoe wading pool around spa, 40,000 gallons
    Hayward Aquarite SWG, Pentair IntelliFlo VS Pump 3HP(main) 011018
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    Mod Squad jblizzle's Avatar
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    Re: question after acid washing

    I do not know the difference, but either is fine.
    Jason, TFP Moderator
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    Re: question after acid washing

    The dihydrate just contains two water molecules attached to each calcium chloride molecule. That makes the dihydrate type about 77 percent calcium chloride. The only difference is that you have to use more of the dihydrate type.

    You can use the pool math tool in my signature to calculate the correct amount.

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    Re: question after acid washing

    Hey Omar, good to see you moving forward!

    Good plan on waiting to test the CYA. Easier to put it in than take it out.
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