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Thread: Adding Calcium Chloride

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    Adding Calcium Chloride

    We are in the 3rd day of our pool startup and here are our pool chemistries.

    pH= 7.2
    TA= 80
    CH= 120
    FC= 0

    Should I be addressing the CH at this time?
    Does plaster dust add to CH?
    I have a bag of Calcium Chloride pellets by DOW to increase my CH. What is the best way to add these pellets to a new pool?

    Indoor pool
    20,000 gal pebble finish
    In-Pool spa
    4x160 Pentair pump
    2hp Pentair pump
    Pentair 320 cartridge filter
    400k Pentair gas heater


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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Adding Calcium Chloride

    With fresh plaster/pebble you should not raise TA or CH for the first three or four weeks. As the plaster cures it will raise the PH, TA, and CH levels. This happens quickly for the first three or four weeks and then much more slowly for up to a year. After three or four weeks, once that initial rise has slowed down, you should adjust CH.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Adding Calcium Chloride

    Thanks for the information.


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    Re: Adding Calcium Chloride

    This article on new plaster startup might be useful to you.

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    Re: Adding Calcium Chloride

    I'll wait a couple of weeks, then test my CH. If I need to increase my CH, how do I add the calcium chloride pellets to the pool...broadcast over pool area or dissolve first before adding?


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    Re: Adding Calcium Chloride


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