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Thread: How long after last Borax / Mur Acid addition, can we swim?

  1. Back To Top    #1

    Join Date
    Jul 2009
    Location
    Martinez,Ca
    Posts
    9

    How long after last Borax / Mur Acid addition, can we swim?

    Hi there,

    OK I'm another person who will do the Borate addition.
    I plan on doing it today :P . I have my 12 boxes of Borax ready
    and my 3+ gallons of Mur Acid. So.....

    HOW LONG after the last addition and wall scrubbing,
    can we go swimming.

    Also it was stated that the pH
    will need 48 hours to stabilize, but should I do some pH or TA
    testing TODAY, and what levels am I looking for ?

    TA is Now at 90, pH is between 7.4 and 7.5
    Ross Biondo

    16,000 gal ,plaster , cartridge filter, IG pool with aerated spillover spa.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: How long after last Borax / Mur Acid addition, can we swim?

    Wait at least an hour after the borates addition with the pump running, then test the PH. If the PH is between 7.2 and 7.8 you can swim. After 24 hours, test the PH again before swimming. Regardless of what the PH is now, test it again 48 hours after the borate addition and adjust as needed at that point.
    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

  3. Back To Top    #3

    Join Date
    Jul 2009
    Location
    Martinez,Ca
    Posts
    9

    EXCELLENT Borax/Muriatic acid RESULTS ***

    A GREAT :P follow up to my previous post.
    2 days ago , in keeping with BBB, I switched to 12.5% bleach as my chlorine source.
    Also, 2 days ago, I did the scary part and added 12 boxes of Borax and the 3+ gallons of Mur acid. I precisely followed the directions of Waterbear, with my wife still wondering " are you SURE
    about the TWELVE boses of Borax?".
    The pool is now STUNNING. Everyone comments on the clearness and shimmer. To me it looks like liquid crystal, and it was already good water to begin with. Some have mentioned a softness. I like the algaecide properties, since we have constant leaves from the trees that shade the pool.
    Out of curiosity I did full tests today, using FAS-DPD, another great TFP recommendation, and using the other TF-100 Taylor kit tests and LaMotte test strips.... numbers are:

    Borate : 50 , FC : 7.5 ( after adding 3 ppm today), CC less than 0.5, CYA = 55, pH = 7.4 , TA = 100 , CH = 350, Phos = 200 . Seems good to me !
    I think I also read that the pH will tend to naturally rise, since I have a aerated spa that spills into the pool , and since I am now using bleach.

    I want to thank all of you, WaterBear in particular, who have helped me
    with the pool that came with my house, when I moved in 2 months ago.
    I am now a true believer of the unbiased opinions of the TFP website.
    I still go to the pool store to get 12.5% bleach, 5 gallons for $20, but
    not much else. I now cringe when I see all those huge containers of
    Tri-Chlor and Cal-Hypo, because I was never steered away from them.
    I was just told " drain 1/2 the pool when CYA gets too high" and "add Caltreat
    when the Calcium gets too high" . And I was NEVER told that FC of 2-4 is too low based on my CYA of 55 with my outdoor pool .

    Thanks to TFP I now feel I can help my neighbors and friends that have a pool.

    Thank you all, now it's time to have some wet FUN
    Ross in sunny 95 degree , Nor Cal .
    Ross Biondo

    16,000 gal ,plaster , cartridge filter, IG pool with aerated spillover spa.

  4. Back To Top    #4

    Re: How long after last Borax / Mur Acid addition, can we swim?

    I agree with Ross. With Borax, the water looks crystal clear, shimmers, and feels softer. And, he's right, the pool stores know nothing about calculating the CYA level when adjusting your chlorine/shock level. Thanks again to TFP.
    20,000 IG, freeform, plaster, PacFab Mitra 80 gpm cartridge filter,
    1.5 hp pump, bleach, borax, crystal clear water

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