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Thread: CSI Question

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    Join Date
    Jun 2015
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    The Woodlands, TX
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    CSI Question

    Just tested my pool and thought my levels were good until I hovered over my CSI calc of -.36..."Potential to become corrosive to plaster"

    Say what?

    24000 gallon pool, in ground, plaster, pebble tech pool deck, SWG, cartridge filter. What am I doing wrong here? Here are my levels:

    FC 5
    CC 0
    TC 5
    CH 350
    pH 7.5
    TA 60
    CYA 60
    Salt 3000
    Bromates 0
    88*
    Blue Haven Pool, 24k oval, Quartz, Hayward smart flilter 550sf, cartridge, AQL-PS-16-x288 Controls, AL turbo cell SWG, Polaris pressure side cleaner, Spa, Hayward H400IDL2 heater, Rock water fall

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    Richard320's Avatar
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    Re: CSI Question

    Let pH climb a little or raise TA.

    If you want immediate results, a 4 lb box of baking soda will take TA up to 70 and drop CSI to -.25
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: CSI Question

    Thanks Richard. Just found that while adjusting the calculator. Borax will raise pH as well, correct?
    Blue Haven Pool, 24k oval, Quartz, Hayward smart flilter 550sf, cartridge, AQL-PS-16-x288 Controls, AL turbo cell SWG, Polaris pressure side cleaner, Spa, Hayward H400IDL2 heater, Rock water fall

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    Texas Splash's Avatar
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    Re: CSI Question

    Borax for pH rise - yes. Good you noticed the CSI row. Now that you have you'll always key-in on it. That's good.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  5. Back To Top    #5

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    Re: CSI Question

    A touch of panic, but yes, I always check the CSI row. I've noticed 2 areas of discoloration in the shallow end and near my drain. I wonder if the plaster corroded in those areas? This is my 2nd year on TFP, so I'm still a newb to this!
    Blue Haven Pool, 24k oval, Quartz, Hayward smart flilter 550sf, cartridge, AQL-PS-16-x288 Controls, AL turbo cell SWG, Polaris pressure side cleaner, Spa, Hayward H400IDL2 heater, Rock water fall

  6. Back To Top    #6
    Richard320's Avatar
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    Re: CSI Question

    Quote Originally Posted by YouRang View Post
    Thanks Richard. Just found that while adjusting the calculator. Borax will raise pH as well, correct?
    Yes, but baking soda is easier to find late on a Sunday afternoon.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: CSI Question

    Quote Originally Posted by Richard320 View Post
    Yes, but baking soda is easier to find late on a Sunday afternoon.
    Agreed. I've been running my waterfall regularly trying to get the pH up too. I got a little carried away with the muratic acid. I chased my TA all summer last year so i was trying to avoid chasing my TA all summer again. I tested it last night with an old Leslie's kit and had TA of 130, so either last night is wrong or tonight is wrong. I tested twice tonight, so I'm sure TA=60 is correct.
    Blue Haven Pool, 24k oval, Quartz, Hayward smart flilter 550sf, cartridge, AQL-PS-16-x288 Controls, AL turbo cell SWG, Polaris pressure side cleaner, Spa, Hayward H400IDL2 heater, Rock water fall

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