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Thread: Switch to bleach, PH drifting up

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    Switch to bleach, PH drifting up

    I was using trichlor in the big bucket from Wally, my PH was solid at 7.5, TA is 110, chlorine holding nicely.I switched to bleach because my CYA reached 85 and would like to continue using bleach. I have a fountain on my return, this aeration and swimming has caused my PH to rise recently 7.8. The chlorine level don't seem to hold as well overnight, I'm showing NO CC's.I added a bit too much acid and wound up at 7.2. I would like a bit more Borates anyway to my pool since the strips say I'm not at recommended level. Is it fine to add Borax to get my PH back to 7.5 or should I aerate. I don't want to end up in a cycle back and forth adding chemicals. I really liked the PH being solid and chlorine holding but something has changed. We have had more hot days also.Pool school says TA 70-90, is this optimum in my case and should I drain the CYA back to recommended 30-50.

    Thanks for the expert help.........
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    Guest

    Re: Switch to bleach, PH drifting up

    Lower your CYA to 50 ppm, it will make your life much easier.
    Then lower your TA to 70 or 80 ppm. Your ph will become more stable.
    Third bring your borates up to 50 ppm.

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    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Switch to bleach, PH drifting up

    The trichlor is acidic, it was helping to hold the pH down. I get the same effect when I'm using tabs in the floater; pH and FC don't move. When you stop using trichlor you need to compensate with both bleach and acid. Borates should help; I haven't used them in my pool but I have been really impressed how well they've worked in my spa.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    Re: Switch to bleach, PH drifting up

    Waterbear, thanks for your reply. Just to be clear I lower CYA to 50, check PH, then lower PH to 7.2 with acid and aerate to 7.5 progressively until TA is 70-80. Then with PH 7.5 and TA 70-80 start the Borate procedure for 50 ppm.

    Thanks
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Switch to bleach, PH drifting up

    That is right. You can lower the PH a little lower than 7.2 if you want. I normally say to aim for 7.0 to 7.2 for lowering TA.
    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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    Guest

    Re: Switch to bleach, PH drifting up


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    Re: Switch to bleach, PH drifting up

    Thanks guys. Now lets fix some pool water.
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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