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Thread: Question about CSI

  1. Back To Top    #1
    drestes's Avatar
    Join Date
    Sep 2013
    Rome, GA

    Question about CSI

    Hi all - I tested my water today and everything looked to be in range. Below are my test results:

    FC 4
    CC 0
    pH 7.5
    CYA 70
    TA 60
    CH 50 (pool is vinyl liner)
    Salt 3300
    Current Pool Temp 76

    I plugged my results into Pool Math and got a CSI of -1.35, well outside the suggested range. Do I even need to be worried about CSI since my pool is vinyl? I don't have a great understanding of the whole CSI thing
    18 x 36 vinyl liner IG pool, grecian shape, ~27k gal
    1.5 hp Hayward Super Pump, Hayward DE3620 Filter
    Hayward Aqua Rite Electronic SWG, Polaris 280 Pool Cleaner
    TF-100 test kit with SpeedStir

  2. Back To Top    #2
    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Greenville, SC

    Re: Question about CSI

    It says

    Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools.
    Greater than 0.6 is suggestive of problems for all pools
    So don't sweat it!
    35K gallon Krystle Krete (Plaster) - Sand Filter - TF100
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  3. Back To Top    #3
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Question about CSI

    That's right. Vinyl pools only need to worry about high positive CSI, above 0.6.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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