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Thread: High Alkalinity / Low ph

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    High Alkalinity / Low ph

    I've been fighting this battle for 10 years, and no one has given me workable solution. My pool is 9000 gallons, fiberglass/ceramic, and is covered during the winter. Water is extremely hard and very high ph (Las Vegas). I use triclor. Within several weeks of opening the pool, the ph drops dramatically. I continually add ph increase on a weekly basis, which, in turn, dramatically raises total alkalinity and scaling begins. Some have suggested adding muriatic acid to drop the alkalinity, which, in turn, drops the ph. Others have suggested not worrying about the alkalinity. I usually just end up dealing with having to raise the ph, live with the higher alkalinity, brush away the scale, and change out half the water each spring. Any advice?

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    Mod Squad jblizzle's Avatar
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    Re: High Alkalinity / Low ph

    Welcome to TFP!!!

    Your pH is dropping because you are use the trichlor tablets.
    What is in "ph increase"? If you use borax to raise the pH, the TA will not rise as much.

    You do realize that the tablets are raising your CYA level as well and ultimately that too will required replacing water, right?

    I suggest starting to read some of Pool School starting with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
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    Re: High Alkalinity / Low ph

    You don't need to use pH Increase. Just aerate the water somehow - fountain, turn returns upward, etc. That way TA will lower, and in turn eventually will stabilize pH.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: High Alkalinity / Low ph

    Quote Originally Posted by RobbieH View Post
    You don't need to use pH Increase. Just aerate the water somehow - fountain, turn returns upward, etc. That way TA will lower, and in turn eventually will stabilize pH.
    His pH won't stabilize if he continues to use Trichlor tabs since they are acidic. He needs to 1) get a proper test kit, 2) post a full set of test results, 3) take corrective action based on those test results. I suspect the CYA is high so that a partial drain/refill may be needed, but we should get accurate test results first before recommending anything.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: High Alkalinity / Low ph

    Quote Originally Posted by chem geek View Post
    His pH won't stabilize if he continues to use Trichlor tabs since they are acidic. He needs to 1) get a proper test kit, 2) post a full set of test results, 3) take corrective action based on those test results. I suspect the CYA is high so that a partial drain/refill may be needed, but we should get accurate test results first before recommending anything.
    Thanks for the advice. I'll get on this. Any suggestions instead of triclor?

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    Mod Squad jblizzle's Avatar
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    Re: High Alkalinity / Low ph

    Yes, read the links I provided, specifically the last.

    And post up the test results.
    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
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