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Thread: Do I have a potential problem

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    TripleB4me's Avatar
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    Do I have a potential problem

    When I put my numbers in the pool calculator:

    FC=3, pH=7.4, TA=70, CH=200, CYA=60, borates=50, salt=3100 and the temp is 85.

    I get a CSI= -0.64. Is this a problem or a potential problem?
    20x40 IG Vinyl, 1.5 HP Whisperflo, Sta-Rite System 3 (300) Sq. ft Cart
    Intellichlor IC40 SWCG, 125,000 BTU Pentair heatpump, Polaris 280
    7' IG FG Spa, 2 HP Whisperflo, Pentair Dynamic III Cart (100) Sq. ft

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    JasonLion's Avatar
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    Re: Do I have a potential problem

    No, no problem at all. You have a vinyl pool, so it is fine if the CSI is very low. You will only have a problem if the CSI is too high.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    TripleB4me's Avatar
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    Re: Do I have a potential problem

    Well that's good news. I was/am still a bit nervious about my limestone coping and my CSI.

    I thought my numbers were pretty typical of a balanced pool. Which of them are out of whack if I had a gunite/plaster pool?
    20x40 IG Vinyl, 1.5 HP Whisperflo, Sta-Rite System 3 (300) Sq. ft Cart
    Intellichlor IC40 SWCG, 125,000 BTU Pentair heatpump, Polaris 280
    7' IG FG Spa, 2 HP Whisperflo, Pentair Dynamic III Cart (100) Sq. ft

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    JasonLion's Avatar
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    Re: Do I have a potential problem

    As long as the limestone is above the water line there shouldn't be any issue because of CSI. There is a small risk to the limestone from the salt in the water. I would use sealer on the limestone if you haven't already. Rinsing it off with a garden hose once a week might also be a good idea.

    In a plaster pool I would raise CH to 250 or 300 and try to keep PH between 7.5 and 7.8. But with vinyl you should be fine.
    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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    TripleB4me's Avatar
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    Re: Do I have a potential problem

    Thanks, Jasonlion! I see that a small change in pH and CH make a big difference in the CSI.
    20x40 IG Vinyl, 1.5 HP Whisperflo, Sta-Rite System 3 (300) Sq. ft Cart
    Intellichlor IC40 SWCG, 125,000 BTU Pentair heatpump, Polaris 280
    7' IG FG Spa, 2 HP Whisperflo, Pentair Dynamic III Cart (100) Sq. ft

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