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Thread: Should I raise CH?

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    Should I raise CH?

    We are currently fighting black algae in our white plaster pool. Have been shocking it at FC 35+ along with brushing with a SS brush.

    We've had some rain and it dropped our CH level a bit from 190 to 150. I'm not sure if I should increase the CH level or not. In the past on the board I was told that my CH level was fine when it was at 190 but the recommended levels for plaster pools are much higher (250 - 300). I'm assuming 150 is enough of a drop that I should raise the CH level.

    Should I raise the CH to 250 or just back up to around 190?


    17,000 IG White Plaster Cart Filter Jet Vac Sweep new pumps and filter system this year; pool re-plastered 18 months ago

    FC 38
    CC 0
    pH 7.8 (not accurate given high FC levels)
    TA 130
    CH 150
    CYA 55
    17,000 gal IGP, White plaster, Hayward Swimclear Cartridge Filter system, Sta-Rite Max-e-pro 1/2 hp pump; 3/4 hp booster pump

    Sacramento, CA

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Should I raise CH?

    Yes, you probably should raise your CH level a little.

    Part of what is going on is that your TA level is a bit high. When TA is high CH can be lower than when TA is at normal levels. So long as your TA is high, it is alright for your CH level to be a bit low. If you are leaving TA where it is, you should aim for a CH level of around 200. If and when you lower your TA you should being CH up to 250.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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