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Thread: pH Level for SLAM'ing

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    clmsntiger1's Avatar
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    pH Level for SLAM'ing

    I have a question about pH level for SLAM'ing. I know pool school calls for a pH between 7.2 and 7.5 before starting the process. How does a higher pH (7.8 for instance) affect the SLAM process?
    16x32, IG, vinyl, 23,500 gallons with Hayward S-244T sand filter,
    1.65 HP VS Pump, using TF-100 test kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: pH Level for SLAM'ing

    I believe chlorine's killer power is optimized at 7.2-7.4 range.

    Also, knowing that once you raise your FC over 10 that the pH test is invalidated you'll know your pH is in order if you've put it at that lower range at the onset of the SLAM.
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    Mr Bruce's Avatar
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    Re: pH Level for SLAM'ing

    Guess who:

    Quote Originally Posted by chem geek View Post
    If one is going to shock at high levels using a hypochlorite source of chlorine (bleach, chlorinating liquid, Cal-Hypo, lithium hypochlorite), then one should lower the pH first before doing so. Adding chlorine raises the pH. Though it will come back down when the FC level drops, you don't want the pH to get too high because it can precipitate metals that can cause staining, can cause cloudiness from over-saturation of calcium carbonate, and at much higher pH the active chlorine level goes down significantly.
    Algae bloom while getting CYA down to manageable levels
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    clmsntiger1's Avatar
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    Re: pH Level for SLAM'ing

    Thanks for the replies! It sounds like it doesn't adversely affect the actual process of killing the algae unless the pH gets really high, but could impact the clarity of the water or cause staining.
    16x32, IG, vinyl, 23,500 gallons with Hayward S-244T sand filter,
    1.65 HP VS Pump, using TF-100 test kit

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