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Thread: adjust pH to achieve best CSI as temp drops?

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    tedinelkgrove's Avatar
    Join Date
    Jul 2009
    Elk Grove, CA

    adjust pH to achieve best CSI as temp drops?

    Pool calculator gives me a better CSI w/ a higher pH at lower temps. Should I keep pH at 7.8-8.0 if that is optimal based on my current water chemistry:

    CSI, 0.02
    Water Temp 55F
    pH 7.9
    TA 70
    CH 310
    CYA 45

    CSI is -.27 with pH 7.6 and all else remaining the same. First winter as a pool owner and just want to make sure I don't let anything get out of whack.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: adjust pH to achieve best CSI as temp drops?

    The pH normally rises on its own as the water temp drops and that tends to keep the CSI fairly constant. If for some reason this didn't happen with your pool, then yes you could raise the pH somewhat. It's not that big a deal, especially since the water temp is cold so everything slows down.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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