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Thread: PH

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    How long does it take acid to bring down PH? I added 3 cups last night but PH is still 8.2
    17K gal, AG, Hayward Sandfilter, new to the BBB method.

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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: PH

    What is your FC level? If it is above 10, you are probably getting a false high reading. Also, the typical drop based test does really measure above 8.2, so it is possible you are very high. My ph usually changes/stabilizes ~1 hour after adding the MA.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: PH

    You should be able to retest and adjust pH within an hour.

    As linen said, FC over 10 can skew the pH test for a false high reading.

    What is your TA? And, do you use borates? If yes, what is borate level?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: PH

    How long does it take acid to bring down PH? I added 3 cups last night but PH is still 8.2
    Results should be evident in one hour. Add 1 quart more in that pool to reduce pH from 8.2 down to 7.4 and retest in an hour or so....pump running. I assume your acid is 31.45%
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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