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Thread: lowering Ph

  1. Back To Top    #1

    Join Date
    Mar 2009
    Location
    eastern washington state
    Posts
    275

    lowering Ph

    Hi
    i want to lower my ph so i can aerate to lower the TA
    But when i put the numbers in the calculator it say 56 gals of MA to go from 7.8 to 7.0 this just does not seem right..
    my number are
    FC 5.0
    CC 0
    TC 5.0
    PH 7.8
    TA 120
    thanks
    jim
    live in eastern washington state
    18x36, Vinyl inground 24k
    Hayward 1 hp filter pump
    1 skimmer/2 returns
    24" sand filter, polaris 280 with booster pump.

  2. Back To Top    #2

    Join Date
    Jan 2009
    Location
    Southern Nevada
    Posts
    37

    Re: lowering Ph

    I am far from being an expert but when I looked at The Pool Calculator for a pool that is 25,000 gallons the results were
    20 oz of 15.7% MA or 13 oz of 31.45% MA.

    oops upon further review I only put in 2500 gallons.... sorry back to being a silent lurker!
    18,500 gallon, 16' x 38' freeform ig plaster w/ 7 ft spill over spa
    Pentair C&C+ 420 cart, Inteliflo 4 x 160 pump - new plaster on 5/5/09

  3. Back To Top    #3
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: lowering Ph

    Aeration doesn't lower the TA, the muratic acid does. The MA lowers both the TA and the PH, then the aeration raises the PH back up to where you want it.

    For example, if your TA was perfect, but your PH was a little low and you wanted to raise it, then all you need is aeration.

    Can I ask why you want to lower the TA? It's not all that high. If you are experiencing the PH drifting up and having to make frequent additions of acid to reduce the PH, then yes, go ahead and begin the Lowering TA process. But if your PH is pretty stable, there is no need to do so. You could just add a bit of MA to lower the PH to 7.5 - 7.6 and be done with it.

    I entered 25,000 gallons into Jason's Pool Calculator and came up with 3qts, 1 cup of 31.45% MA to lower the PH from 7.8 to 7.0. But again, is that really what you want to do?

    If you want to bring the PH down to 7.5, then only add 3 cups of 31.45% Muratic Acid.

    Hope this helps.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: lowering Ph

    I get the same numbers as frustratedpoolmom.

    I am interested in finding out how people make mistakes using my Pool Calculator. If you figure out what you entered incorrectly, I would love to know so I can help people avoid making the same mistake next time.

    When calculating PH changes in my Pool Calculator, remember to set the current TA and Borate levels in the Now column.
    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

  5. Back To Top    #5

    Join Date
    Mar 2009
    Location
    eastern washington state
    Posts
    275

    Re: lowering Ph

    yes poolmom the Ph keeps creeping up. it seems that iam putting MA in about every 3rd day.. creeps up to 7.8 and then i add MA to get down to 7.3 to 7.4.
    Just thought if i lower the TA down a bit, and then add borates i could keep the PH more even... was just a thought that i had from all the reading i have done on the forum and the pool school..
    yes i did know that the MA is what lowers the TA and the air is what raises the PH back up to what you want... I guess i did not word it like i should have
    thanks for all the help,,, pool looks great
    jim
    live in eastern washington state
    18x36, Vinyl inground 24k
    Hayward 1 hp filter pump
    1 skimmer/2 returns
    24" sand filter, polaris 280 with booster pump.

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