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Thread: Measuring & Adding Calcium Hardness Increaser

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    Butterfly's Avatar
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    May 2007
    South Carolina

    Measuring & Adding Calcium Hardness Increaser

    I need to add Calcium Hardness Increaser to the pool, but need to know how to measure by CUPS FULL.... (it was given to us by pb in broken bag & dh put in bucket) Here are my #'s:
    CYA.....20 (but added some today trying to bump to around 40)

    I think the range is 200 to 400 and we would like to seek the middle ground, around 300, if you think that is appropriate. Also, I would like to add the increaser to the skimmer, if okay? Thanks in advance. Joyce
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  2. Back To Top    #2
    ktdave's Avatar
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    May 2007
    Katy, TX
    To increase your calcium hardness from 200 ppm to 300 ppm you will need to add 17 lbs of calcium chloride according to BleachCalc.
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    JasonLion's Avatar
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    May 2007
    Silver Spring, MD
    Most powdered chemicals are around 1/2 lb per cup. This can vary by 20-30% depending on how finely ground it is and how much the powder is packed down.
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