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Thread: New plaster-2 Gal of Acid and PH finally moves!

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    Join Date
    May 2007
    Location
    West Chester, PA
    Posts
    53

    New plaster-2 Gal of Acid and PH finally moves!

    Hi everyone! I'd love your thoughts on my numbers just to see if I'm on track.
    TF-100 Results:
    FC 2
    CC 0
    PH 7.8
    TA 100
    CH 210
    CYA < 20
    Temp 77 (new heater going as of Sat--hooray!)

    New Quartz plaster on 5/20.

    I finally beat the PH down to 7.8 after adding almost 2 gallons of muriatic acid (31.45 %) relentlessly over the course of two weeks.
    I'm adding stabilizer via suspended stocking in skimmer and although the black dot is getting cloudier in the test tube I can still see it when the tube is full, so I know it's coming up, just not there yet.
    My TA has risen 10 points over these two weeks. Calcium has come up 20 points in the same time, and I expect it to keep rising.
    Should I try and keep my PH lower than 7.8--or is that ok for now?
    any thoughts?
    thanks in advance
    TF-100 Test Kit, 28,000 gallon IG , 3M quartz plaster '09, 48 sq ft DE filter, Heat Siphon SX5HP heat pump '09, Polaris 360 '10, Protect-A-Child safety fence

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    dmanb2b's Avatar
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    Apr 2009
    Location
    NY
    Posts
    3,728

    Re: New plaster-2 Gal of Acid and PH finally moves!

    definately want to keep your PH in the 7.4-7.6 range....7.8 is your upper limit.

    I would also raise FC to the 3-4ppm range and keep it around 5ppm if your CYA target is 40ppm
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,887

    Re: New plaster-2 Gal of Acid and PH finally moves!

    With fresh plaster, you are going to need to adjust the PH very frequently for the first three or four weeks. You should lower the PH all the way down to 7.2, to give yourself a little more time before it gets back up to 7.8. Try to never let it get above 7.8 at any point.

    Fresh plaster increases the PH, TA, and CH levels rapidly for the first three or four weeks, and then more slowly for up to a year.
    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

  4. Back To Top    #4

    Re: New plaster-2 Gal of Acid and PH finally moves!

    It is common practice to use what is called a low pH startup on new pools(or replasters).
    On Pebble finish pools the acid that is used to wash the final finish is left in the pool. This can be a
    several gallons of acid on a larger pool. The same for plaster pools. Sometimes additional acid is added.

    This low pH is left for severals days or a week and then the pool is rebalanced. This helps the
    curing of the finish. So don't be alarmed if a new pool requires a lot of acid addition, it is just
    the finish curing, after a while it will settle down.

    Cliff s

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