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Thread: CH - how low before adding calcium chloride?

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    efm1972's Avatar
    Join Date
    Jul 2012
    Philadelphia, PA

    CH - how low before adding calcium chloride?

    TFP's recommend CH level for a plaster pool is 250 - 350 ppm. My current readings are:

    FC - 3.5
    CC - 0.0
    pH - 7.5
    Alk - 80
    CH - 225
    CYA - 30

    Last year, CH was about 250 all season. This year I have been at 225. I test using Talor test kit (K-2006).

    This is my 3rd season with pool. Pool was installed in May 2012. Water and plaster look good.

    I haven't done anything at this point, but wanted to know if I should be worried and start to get the CH above 250.

    18,500 gallons, DE filter, IG
    Onyx Ansylbrite (colored) plaster
    Jandy Pump 1.0 HP, Zodiac Filter (flow rate = 120 gpm)
    Installed May 2012

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    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: CH - how low before adding calcium chloride?

    I would go ahead and raise it up to 250. You may just want to get a couple of bags of cal-hypo since you don't have to raise it very much.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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