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Thread: Question on pH testing

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    Question on pH testing

    Often when you add a number of gallons of chlorine (or bleach) the pH test becomes unreliable (the indicator turns red) suggesting a falsely alkaline pH.

    This week my kid may have put too much chlorine in the water. The chlorine level is testing really high. Okay fine. Now when I test the pH, the solution turns red. But how do I know if the pH is really alkaline or not?
    35,000 gal pool, Pebble-Tec, Pentair VF pump, DE filter, Aqua Rite SWG, Pentair Minimax Heater in Southern California

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    duraleigh's Avatar
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    Re: Question on pH testing

    The chlorine level is testing really high.
    What is "really high"?

    Once FC goes above 10 ppm, the pH will read falsely high and can only be considered accurate when the FC falls back below 10 ppm.

    Test and dose carefully.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Patrick_B's Avatar
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    Re: Question on pH testing

    Quote Originally Posted by duraleigh
    The chlorine level is testing really high.
    What is "really high"?

    One FC goes above 10 ppm, the pH will read falsely high and can only be considered accurate when the FC falls back below 10 ppm.

    Test and dose carefully.

    a +1 on this.
    TFP Moderator
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    Mod Squad jblizzle's Avatar
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    Re: Question on pH testing

    Are you using one of the recommended test kits with the FAS-DPD chlorine test? Test and Report the FC.
    Jason, TFP Moderator
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    Re: Question on pH testing

    I have the recommended test kit but I often use the "simple" test kit in a hurry. For ph you put in a dro of thiosulfate then 5 drops of red indicator solution.
    35,000 gal pool, Pebble-Tec, Pentair VF pump, DE filter, Aqua Rite SWG, Pentair Minimax Heater in Southern California

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    Mod Squad jblizzle's Avatar
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    Re: Question on pH testing

    Which recommended test kit? What pH test requires a drop of a second reagent before the red r14/r4? What is your FC?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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