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Thread: Need CSI advice

  1. Back To Top    #1

    Join Date
    Jul 2015
    Location
    Cape May Court House, NJ
    Posts
    130

    Need CSI advice

    Opened the pool yesterday and the water is a beautiful TFP clear yay! But my CSI is a bit low and I'm not sure what to do about it.

    Here are the readings:

    FC: 5
    CC: 0.5
    pH: 7.3
    CH: 225
    TA: 60
    Salt: 2800
    CYA: 70
    CSI: -.99

    Any suggestions for adjustments?
    22K 16'x40' inground fiberglass pool, Hayward Pro Series High Rate Sand filter, Hayward dual speed 2 hp Super II Pump, Hayward AquaRite SWG, Raypak 400K btu propane heater, Dolphin Supreme M400 cleaning robot, CoverPool auto cover. Also stand-alone Sundance Hawthorne 430 gallon hot tub.

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,080

    Re: Need CSI advice

    I'd let things live for a few days to see what happens with the pH. It may rise on it's own over the next several days. If you want to help it rise, you could introduce some aeration by aiming your returns upwards toward the pool surface, creating as much ripples/turbulence as you can. If that does not work, consider adding some borax to raise pH to about 7.6 to 7.8. Use small additions to approach the pH slowly.

    Also... in a fiberglass pool, like vinyl, CSI is not overly critical so don't fret too much about it.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,955

    Re: Need CSI advice

    Don't touch a thing. Your numbers are just about dead on perfect.

    I am not a big fan for this very reason. Your pool is fine and chasing CSI with your fibreglass pool and your NJ location is simply not relevant.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Jul 2015
    Location
    Cape May Court House, NJ
    Posts
    130

    Re: Need CSI advice

    Thanks, guys – I'll live and let live. It looks like swimming weather later this week!
    22K 16'x40' inground fiberglass pool, Hayward Pro Series High Rate Sand filter, Hayward dual speed 2 hp Super II Pump, Hayward AquaRite SWG, Raypak 400K btu propane heater, Dolphin Supreme M400 cleaning robot, CoverPool auto cover. Also stand-alone Sundance Hawthorne 430 gallon hot tub.

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