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Thread: What happens to pH over the winter?

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    UnderWaterVanya's Avatar
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    What happens to pH over the winter?

    What does the pH tend to do when the pool is closed? Does it go up or down in a reliable trend?
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Christian's Avatar
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    Re: What happens to pH over the winter?

    It should stay mostly the same though may raise a little bit. It won't drop unless there is a source of something acidic to drop it.

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    UnderWaterVanya's Avatar
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    Re: What happens to pH over the winter?

    Quote Originally Posted by Christian
    It should stay mostly the same though may raise a little bit. It won't drop unless there is a source of something acidic to drop it.
    Thanks - I asked because I was looking at CSI numbers and trying to determine what mine would look like over the winter as temps drop etc.

    My current numbers:
    FC 12
    pH 7.8 (measured even though above 10 - I've had pretty good luck with a quickly read test - but I will not take action until I'm below FC 10 just to be sure)
    TA 70
    CH 260
    CYA 50-55
    Salt Unknown but > 0 (none added except via Chlorine)
    Borates unknown (none added by me ever)
    water at 70 degrees
    Vinyl In ground pool

    Assuming Salt is 500ppm for the heck of it:

    CSI: negative 0.05
    (so far so good... even with Salt at 0ppm this is a -0.02)

    With water temp down around say 50 degrees and chlorine down to 3 this drops to -0.24, and if I drop the pH to 7.2 the CSI index is now an aggressive -0.8! With Vinyl this may not matter, but I'd like to know before dropping pH that far.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    UnderWaterVanya's Avatar
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    Mint Hill, NC
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    Re: What happens to pH over the winter?

    This post may answer my question indirectly...
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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