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Thread: pH/Alkalinity question

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    pH/Alkalinity question

    So here are my water parameters:

    TA 100
    pH 7.8
    FC 9
    CYA 80

    Just last week, I put in muriatic acid to lower the pH to 7.4 but a week later it is back up to 7.8. My TA is right where it should be so I am very confused. I am adding generic bleach from the grocery store...could it be that the bleach is raising the pH? I have read on other posts here that liquid bleach probably won't raise the pH that much.

    Any advice??
    35k in ground plaster pool, Pentair FNS Plus 48 DE Filter

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    Mod Squad jblizzle's Avatar
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    Re: pH/Alkalinity question

    Who says your TA should be at 100ppm? Generally we recommend it be lower than that.

    How old is your plaster? New plaster can cause the pH to rise for up to a year.
    If you have an aeration, that will also drive the pH up.
    And the higher TA will make the pH rise faster too.
    Also if your top off water has high TA and pH, that will drive it up as well.
    Jason, TFP Moderator
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    Re: pH/Alkalinity question

    Thanks Jason. What do you recommend my TA to be? The test kit says 100-120 for chlorine pools. My plaster is 30 years old...getting it replaced this winter. And yes, I definitely need to check the top off (city water). Good call.
    35k in ground plaster pool, Pentair FNS Plus 48 DE Filter

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    Mod Squad tim5055's Avatar
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    Re: pH/Alkalinity question

    Quote Originally Posted by glintontx View Post
    Thanks Jason. What do you recommend my TA to be? The test kit says 100-120 for chlorine pools. My plaster is 30 years old...getting it replaced this winter. And yes, I definitely need to check the top off (city water). Good call.
    What test kit?

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    Re: pH/Alkalinity question

    Thanks. The link says 70-90+ which mine is not too far from. Should i reduce it to 70? My test kit is the TFT-100 from TFTestKits. The laminated sheet that comes with the test says "100-120 for manually chlorinated pools."
    35k in ground plaster pool, Pentair FNS Plus 48 DE Filter

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    Mod Squad jblizzle's Avatar
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    Re: pH/Alkalinity question

    Just lower the TA until they pH stabilizes. Although once you get new plaster, it is going to rise faster.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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