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Thread: Having trouble getting CH up

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    Having trouble getting CH up

    Hi, I need to raise my CH and it seems it's not going up as much as calculated. Is that to be expected? Below is the history.

    4/10: CH 180 at Leslie's
    4/20: CH 170 using TF100 kit
    4/27: added 64 oz weight HTH Calcium Plus (CaCl), should add 29 CH
    4/29: added another 64 oz, should add another 29 CH
    5/5: CH 210 (expected about 230)
    Pete
    15,000 gallons IG pebble, Sundek plus Luederstone, Pentair FNS Plus 60 DE filter with SM-20-2 valve, Pentair Intelliflow VS pump, Pentair EasyTouch 4 panel, Pentair KreepyKrauly Platinum cleaner, Stenner 45M fixed 10 GPD pump with 15 gallon tank, new pool startup 10/2012

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    Re: Having trouble getting CH up

    128 oz of calcium chloride dihydrate will raise the calcium level by 44 ppm in 15,000 gallons. Starting at 170 ppm, you should get to 214 ppm, which is in line with what you are seeing.

    You have chosen calcium chloride in pool calculator. However, it's unlikely that that's what you used.

    Also, pool volumes and test results are rarely exactly accurate and you have to allow for some expected inaccuracy.

  3. Back To Top    #3

    Re: Having trouble getting CH up

    Hi James, Thanks for responding. I just found the MSDS at
    http://www.whatsinproducts.com//files/b ... 20PLUS.pdf
    and I see it's only 90/95% CaCl so that would result in a little less of a rise but not as low as the 40 I observed. Anyway it looks like I can use the empirical evidence that I'll get a rise of 20 per 64 oz container. Now that I am at 210 I'll add 64oz at a time until I get to or above 250, hopefully just two more containers.
    Pete
    15,000 gallons IG pebble, Sundek plus Luederstone, Pentair FNS Plus 60 DE filter with SM-20-2 valve, Pentair Intelliflow VS pump, Pentair EasyTouch 4 panel, Pentair KreepyKrauly Platinum cleaner, Stenner 45M fixed 10 GPD pump with 15 gallon tank, new pool startup 10/2012

  4. Back To Top    #4

    Re: Having trouble getting CH up

    Based on the MSDS, it does look like HTH Calcium Plus does contain anhydrous calcium chloride.

    It shows that the percent could be as low as 90 %, which would raise the calcium hardness by about 52 ppm in 15,000 gallons. Therefore, you might expect to get to about 220 ppm, which is within the margin of error.

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