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Thread: Add CH or just keep PH higher?

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    Join Date
    Jun 2007
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    Palm Bay,Florida
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    Add CH or just keep PH higher?

    Hi this is my first winter with the pool and now that the water is 65. my Calcite Saturation Index is going neg 3.1 now.
    here are My numbers
    FC 5.0
    CYA 50
    PH 7.6
    Salt 3200
    CH 240
    TA 80

    Pool is plaster just a year old now. just do not want Plaster to get messed up.
    so would letting PH go up to 7.8 be ok. or should I just add some calcium chloride to get CH to 350 to 400 range for the winter Thanks for any help have kept pool water bal all summer just now with cool water is messing me up some.
    14+28 Gunite with Pentair Pinnacale pump and pentair Clean & Clear Filter and Aqua Rite SWG

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    duraleigh's Avatar
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    Speed,

    I do not use the CSI so I'm not sure I understand your question.

    IMHO, Your test result numbers are close to perfect. I see no reason whatsoever to move your pH from 7.6.

    Especially, I see no reason to add calcium to your pool. You are currently near perfect in the 200 range and moving it to 400ppm will provide no benefit and potentially move you closer to a scaling condition.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    For your numbers I get a CSI of -0.44, which is fine. It wouldn't hurt to let the PH go up just a little but it isn't significant. Long term I would probably bump the CH up to between 300 and 400, but others disagree and I wouldn't expect it to make a significant difference.
    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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    Jun 2007
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    Palm Bay,Florida
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    Thanks JasonLion, will get some calcium chloride and get it up to the 300 to 400 range but do not want scale to form so will shot for 320 CH thats were it was all summer. have well water and its soft from water softerner. but cant use water without it going through softener as its got tannin in the water which makes water yellow and do not want that in the pool.
    14+28 Gunite with Pentair Pinnacale pump and pentair Clean & Clear Filter and Aqua Rite SWG

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