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Thread: Low CSI - Suggestions?

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    Join Date
    Aug 2007
    Location
    Hunterdon County, NJ
    Posts
    28

    Low CSI - Suggestions?

    My numbers a week after opening:

    FC 4
    CC 0
    PH 7.5
    TA 90
    CH 320
    CYA 45 (Slowly moving it up to 70)
    Salt 3300
    Borates 30
    Temp 62 F
    CSI -0.41

    With all of the great guidance from this site, I think I've gotten my pool well balanced, except I'm worried about the CSI being as close to -0.6 as it is. Playing with values in http://www.poolcalulator.com, it seems that my best best is to move my PH up to 7.8 which would increase my CSI to a reasonable -0.13. Would a PH that high cause the water bother swimmers? I assume I would need to make sure the PH wouldn't drift even higher. Is that practical? Should I be addressing the low CSI differently? Thanks for any help.
    31,000 gal gunite/Pebblesheen pool w/spillover spa, 2-speed 1.5 HP filter pump, 3 hp spa jet pump, 2 hp sheer decent pump, blower, DE filter, Jandy automation and SWG, Jandy 400K BTU gas heater, Polaris 280 cleaner with booster pump.

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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
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    30,083

    Re: Low CSI - Suggestions?

    Is your water clear? I bet it is.

    If so, I see absolutely nothing in your numbers that would keep you from having crystal water (without issues) for the remainder of the summer.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
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    Re: Low CSI - Suggestions?

    We had a very similar post earlier today actually it was almost identical, should the poster raise the PH to 7.8 to balance the CSI, and this was Jason's response...

    Quote Originally Posted by JasonLion
    Two points. First, you actually want CSI to be a little negative, PH tends to go up and heaters and SWG have higher CSI internally. Second, it really isn't worth trying to balance your CSI to any exact number. All of the numbers will vary over time, especially PH. Trying to micro manage your levels uses too many chemicals.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Low CSI - Suggestions?

    Also, the CSI will go up as the water gets warmer; I wouldn't worry about where you are right now.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    Join Date
    Aug 2007
    Location
    Hunterdon County, NJ
    Posts
    28

    Re: Low CSI - Suggestions?

    Thanks everyone. Indeed, the water is crystal clear. I'll just keep doing what I'm doing and will try not to micromanage my chem levels.

    To give further testament to the methods and advice provided on TFP, I opened my pool last weekend with great results. After leaving my pool uncovered for the winter. One day after opening and vacuuming all of the leaves out, my water was clear and the kids were swimming in the hot tub. My neighbors couldn't believe it.
    31,000 gal gunite/Pebblesheen pool w/spillover spa, 2-speed 1.5 HP filter pump, 3 hp spa jet pump, 2 hp sheer decent pump, blower, DE filter, Jandy automation and SWG, Jandy 400K BTU gas heater, Polaris 280 cleaner with booster pump.

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