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Thread: Testing PH during shock

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    Join Date
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    Testing PH during shock

    I just opened my pool today - slightly green. I shocked it to 16 and then tested the ph. The PH was way too high 8.2. Does the high chlorine level make the ph temporarily high? I tested the ph a few weeks ago before I took the cover off, and it was 7.6. What would cause my ph to go up so high?

    Test results today:
    FC: 16
    CC: 1
    CYA: 50
    PH: 8.2
    Michiele
    Newbie pool owner
    25,000 gallon inground, vinyl lined pool, sand filter

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    duraleigh's Avatar
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    Yeah, most likely a result of the high chlorine. That initial dose is probably down below 10ppm now so you could test pH again before adding more chlorine and should get a fairly accurate test result (if it's below 10ppm chlorine)

    PS - I'd dose your chlorine alittle bit higher (20-25). It drops so quickly when you first put it in, it's hard to keep it above shock value.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Butterfly's Avatar
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    Testing for pH w/chlorine over 10 ppm gives inacurate results. Wait until your FC is below 10 ppm to test for pH.

    EDIT: Dave, apparently great minds think alike :P :P :P
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
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    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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  4. Back To Top    #4

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    Thanks for the replies. I was hoping the ph test was just inaccurate with the high chlorine. I just upped the chlorine to 20 a few minutes ago. I will bring it up to 20 - 25 tomorrow morning. Thanks
    Michiele
    Newbie pool owner
    25,000 gallon inground, vinyl lined pool, sand filter

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