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Thread: FC and pH

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    FC and pH

    Can someone tell me if I have a false pH reading....My FC is 8.5 and my pH is 7. I've read that a high FC will give a false pH reading. I don't want to dump acid in the pool if not necessary and all I need to do is wait for the FC to go down to get an accurate pH reading, thank you, John
    16100 gallon rectangle pool built in 1984 including a 5' X 5'x 3' Spa, Diamond Brite in year 2000, Non-SWG Pool

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    Re: FC and pH

    Correction, The pH is 7.8 not 7. Sorry, John
    16100 gallon rectangle pool built in 1984 including a 5' X 5'x 3' Spa, Diamond Brite in year 2000, Non-SWG Pool

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    linen's Avatar
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    Jul 2010
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    Re: FC and pH

    FC over 10 ppm may give a false reading, so yours is fine.
    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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