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Thread: how many cups of calcium chloride (hardness up) equals 1 pound?

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    how many cups of calcium chloride (hardness up) equals 1 pound?

    this information is not listed on the bucket.

    also, will this product raise the pH?

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    Mod Squad JVTrain's Avatar
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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    3 cups is about 30 ounces by weight (using Pool Math). That's about 10 ounces per cup. So... one pound would be about 1 and 2/3 cups. Or you could just use a scale...
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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    don't have a scale that small

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    No need to be exact. Just estimate the amount based on the container weight and amount. In other words, figure out the percentage and guestimate from there.

    Calcium chloride won't chemically raise the ph. However, I have seen some ph rise in some cases, which I suspect might be due to carbon dioxide offgassing as the chemical is added. Possibly due to the creation of nucleation sites, which is how the coke and mentos reaction happens. Note that this is just speculation.

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    my wife found a food scale. 2 cups is one pound. so i added 2 pounds today. baseline CH level is 190 and pH is 7.7. i'm trying to get CH up to 250. ill post here if pH rises. thanks for everyone's help.

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    Two pounds will only raise the calcium level by 8 to 11 ppm in 20,000 gallons.

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    Sneak up on your target Calcium level. It easy to overshoot.
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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    ok on sneaking up. i've calculated that overall i'll need approx 15 lb hardness up to raise CH by 60ppm

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    Ph is still 7.7 from yesterday, so the little bit of calcium chloride i put in didn't affect pH. i put 5 more pounds in this morning.

    the extended test kit directions section of this site (http://www.troublefreepool.com/threads/24188-Extended-Test-Kit-Directions)
    doesn't mention anything about water temperature when performing the CH test. does the water sample need to be warmed up before performing CH test?

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    chem geek, in another thread, has probably already answered my question:

    (from 3/5/09): Re: Effect of Temperature on Calcium Hardness Reading

    I E-mailed Taylor about this and they said that you should not be using the Calcium Hardness test (or any other test) above 100F. The tests are designed and calibrated for room temperature. Richard

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    CH is 230ppm this morning using warm and cold water samples.
    i added 4 more pounds of hardness up.

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    Re: how many cups of calcium chloride (hardness up) equals 1 pound?

    CH is now 250ppm using cold water sample.

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