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Thread: PH when shocking

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    Scott C's Avatar
    Join Date
    May 2009
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    Dallas, TX
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    PH when shocking

    Hi Guys,
    This is my first post and I find the site extremely informative. One thing I couldn't find is the importance of pH when shocking. I've got a high CYA level right now and am battling some algae growth.

    Before I shocked, I had a pH of 7.5. Post-shock (Raising 15ppm) of about 4 hours, I had a pH of 8.0.

    Is it normal for the pH to jump under shock? Does it make sense to adjust the pH under shock?

    Thanks again guys.

    Scott in Dallas
    45,000 gal IG Gunite with 24" sand filter

    The laws of physics and common sense are strictly applied

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    Join Date
    Aug 2007
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    Northeastern Ohio
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    178

    Re: PH Swings and pool damage

    It's best to start your own thread when seeking answers. Moved into it's own topic. JasonLion

    PH tests are not reliable when you are shocking your pool. Don't worry about PH until you get your algae under control and your FC is no longer at shock level.
    ~30000 GAL In-Ground 26'x50' Kidney Shaped Pool
    Hayward EC-75 DE Filter w/1.5HP Hayward SuperPump
    daily user of JasonLion's Poolcalculator
    (12) 2x10 SunGrabber Solar Panels...now if only there was some sun to shine on them!

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    Guest

    Re: PH when shocking

    Hi chlorine levels cause the pH test to register falsely high. (Lengthy explanation about how the chlorine converts the phenol red indicator into chlorphenol red and how that changes color at MUCH lower pH than phenol red.) Ignore it until your FC drops to normal levels.

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    Scott C's Avatar
    Join Date
    May 2009
    Location
    Dallas, TX
    Posts
    6

    Re: PH when shocking

    Thanks guys. This was what I expected but wanted to consult the pros.

    Once the algae is under control, I'll see where the pH settles.
    45,000 gal IG Gunite with 24" sand filter

    The laws of physics and common sense are strictly applied

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