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Thread: Measuring & Adding Calcium Hardness Increaser

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    Butterfly's Avatar
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    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:
    FC......3.5
    CC.....0
    TC.....3.5
    pH.....7.5
    Alk.....100
    Cal.....200
    CYA.....20 (but added some today trying to bump to around 40)
    Temp...85

    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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    ktdave's Avatar
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    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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    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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