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Thread: Possibly Stupid Question about Fountains and PH in IG Pool

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    Swampwoman's Avatar
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    Possibly Stupid Question about Fountains and PH in IG Pool

    Greetings, all. In the course of attempting to correct a calculation error/stupid mistake on my part adding muriatic acid too quickly (in one fell swoop, 2 gal!) I felt compelled to get the PH back up quickly via the fountain I had just purchased (floating grecian that attached to a return.)

    My PH was back up to 7.0 this a.m. from a rather drastic drop to pure yellow yesterday a.m., so I was quite pleased with the outcome and will continue aeration as needed to get back up to 7.5. My TA is down to 120 from 180...but I am assuming I will have to (carefully) lower it further if I later want to add borates for swimmer comfort (right?)

    HOWEVER, I also am really enjoying the fountain. So here's what's PUZZLING me.
    If I am raising the PH via using the fountain, what do folks do who WANT to use the fountain all the time....do to control what I assume would be a constant PH drift upward ... whole reason I was adding the acid was to avoid the ph drift upward...

    So for those who have fountains, what do you do? Does the ph drop when you turn it back off? Do you just drop the ph now and then using acid?

    Inquiring minds would like to know

    Thanks in advance for your continued guidance!
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    JasonLion's Avatar
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    Re: Possibly Stupid Question about Fountains and PH in IG Po

    The fountain interacts with the TA level to raise the PH. If TA is high, PH comes up quickly. As the TA level comes down the rate of PH increase slows down and eventually stops, even if you continue running the fountain.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Swampwoman's Avatar
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    Re: Possibly Stupid Question about Fountains and PH in IG Po

    Awesome. So I will be able to keep the feature without extra fussing -- fantastic news.

    So would you recommend further (and more careful) lowering from 120 if the ph after agitation can get back up around 7.5-7.6?
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    JasonLion's Avatar
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    Re: Possibly Stupid Question about Fountains and PH in IG Po

    Yes, keep adding acid every time the PH comes up until TA is down to around 60 or 70. At first that will go fairly quickly, but it will slow down dramatically later on.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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