Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: borax for stabilizer

  1. Back To Top    #1

    Join Date
    Mar 2015
    Location
    South Texas
    Posts
    411

    borax for stabilizer

    So I have a situation that I am preparing for and am using PoolMath to crunch some numbers but I just want to confirm first. By the way, this is not my pool in my signature.

    Details:

    10,000 gallon pool that I am currently SLAMMING, hope to finish tonight. Before the SLAM, PH was 7.2. CYA is 35. According to PoolMath, when I am done with the SLAM of course, I need to add 60 oz. of stabilizer to bring the CYA up to 80 (It's a SWG pool). Also according to PoolMath, that will lower my PH by 0.8, which would make my PH 6.4. I would then need to add 148 oz. of Borax to get it back to 7.2

    That seems like an awful lot of Borax. Is it possible that the CYA will not actually lower the PH that much? 6.4 is awfully acidic. So my basic question is: Do I trust PoolMath and add exactly these amounts? Or should I add the CYA, retest PH, and go from there?
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: borax for stabilizer

    I'd retest after adding the CYA. Did you make sure to measure TA and have that in Pool Math as well?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,587

    Re: borax for stabilizer

    The pool math section entitled "Effects of Adding Chemicals" does not accurately predict pH changes for large additions of chemicals. You'll also note there's a warning there that states the numbers for pH are based on assumptions about the other pool water parameter.

    Adding that much CYA will not change your pH that much. CYA is acidic but it's a relatively small amount being dispersed into a very large volume of water and it dissolves VERY slowly so the pH impact will be minimal at best.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  4. Back To Top    #4

    Join Date
    Mar 2015
    Location
    South Texas
    Posts
    411

    Re: borax for stabilizer

    WHEW. Thanks for the quick responses. I'm glad I asked before making a possibly huge mistake with someone else's pool

    Man, just when you think you "know" everything. And, no, I haven't even tested the TA yet. Will do that first, add the CYA and let mix for a while (day-ish). Then measure PH before adjusting. Sound better?
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •