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Thread: Pool School Recommendations for SWG Pool

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    Johnl's Avatar
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    Pool School Recommendations for SWG Pool

    I am in the process of purchasing a SWG and was reviewing the Pool School recommendations for balancing water in a SWG pool. I was surprised the TA was listed in the 60-90 range, so I plugged in the recommendations into the Pool Calculator. When I did that the results came back that the water may be corrosive to plaster. Is that correct or am I missing something?
    23K Gunite IG Pool
    Waterway Crystal Water SVL56 Pump/1.5HP AO Smith Motor
    Hayward Star-Clear Plus Cartridge Filter C17502
    Aquarite 40k SWG
    Polaris 360

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    Re: Pool School Recommendations for SWG Pool

    CSI depends on several factors and TA is just one of them. Post your full test results for us and we can help you determine what adjustments might need to be made.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

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    Johnl's Avatar
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    Re: Pool School Recommendations for SWG Pool

    Here are my current pool test results
    FC - 3.0
    PH - 7.5
    TA - 155
    CH - 275
    CYA - 60
    Pool calc results = .1 (Balanced)

    Pool School Recommendations for SWG Plaster pools
    FC - 3.0
    PH - 7.6
    TA - 90
    CH - 300
    CYA - 80
    Salt - 3000
    Pool calc results = -.31 (Potential to become corrosive to plaster)

    The SWG is not installed yet, but I'm hesitant to make the changes recommended in the pool school because it seems to conflict with the pool calc results.
    23K Gunite IG Pool
    Waterway Crystal Water SVL56 Pump/1.5HP AO Smith Motor
    Hayward Star-Clear Plus Cartridge Filter C17502
    Aquarite 40k SWG
    Polaris 360

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    JasonLion's Avatar
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    Re: Pool School Recommendations for SWG Pool

    The CSI at some spots inside the SWG cell is far higher than it is in the pool. To avoid calcium scaling on the SWG cell plates it is good to keep CSI somewhat negative in the pool. Note that a CSI of -0.31 just says "Potential to become corrosive to plaster". CSI has to go noticeably lower than that before there is a real problem. Since a SWG tends to push the PH up, which increases CSI, it is quite unlikely that CSI will dip down into dangerous territory.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Johnl's Avatar
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    Re: Pool School Recommendations for SWG Pool

    Good to know. Thanks for the explanation.
    23K Gunite IG Pool
    Waterway Crystal Water SVL56 Pump/1.5HP AO Smith Motor
    Hayward Star-Clear Plus Cartridge Filter C17502
    Aquarite 40k SWG
    Polaris 360

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    Re: Pool School Recommendations for SWG Pool

    When you install your SWCG, you will also note that pH rise may be something that you might have to address more frequently than before. This sort of goes along with having a SWCG. It may be at this time that you find it beneficial to lower your TA some to help tamponade this pH rise trend to a certain degree. This is the benefit of having the pool calculator because you can see how adjustments in the values of certain things like pH and CH can affect your CSI. For example, lowering your TA may mean that you would need to compensate by adding more calcium to keep your CSI where you want it. Does this make sense?
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

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    Johnl's Avatar
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    Re: Pool School Recommendations for SWG Pool

    Yes, that makes sense. I'll probably avoid adjusting the CH higher because our fill water is 275 - 300 naturally and don't want that to get to high.
    23K Gunite IG Pool
    Waterway Crystal Water SVL56 Pump/1.5HP AO Smith Motor
    Hayward Star-Clear Plus Cartridge Filter C17502
    Aquarite 40k SWG
    Polaris 360

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