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Thread: Types of Calcium Chloride

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    Types of Calcium Chloride

    I see on pool math there are two types of Calcium Chloride. One being Dihydrate and the other I assume is Anhydrous. Ive been looking around the internet and all I see is the Dihydrate type. Unless I'm wrong. The dosage amounts seem to line up with the Dihydrate dosage on poolmath at least. I havent found anything that matches the Anhydrous version. The closest thing I have found from the dosage amounts is this: http://www.poolsupplymall.com/pool-c...reaser-15-lbs/ at 1LB per 10,000 gallons to raise CH 10ppm.

    Ive seen that the Dihydrate type is 77-80% Calcium Chloride and the Anhydrous type is 90+%. That doesnt make sense since Leslies Hardness Plus MSDS shows 94-97% Calcium Chloride (http://www.lesliesmsds.com/Document/...f5030f1c83.pdf) and the dosage shows Dihydrate on poolmath.

    How do you know which type you are getting?
    Are there any brands of Anhydrous Calcium Chloride?
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    Re: Types of Calcium Chloride

    It is difficult to find anhydrous calcium chloride since CaCl2 is hygroscopic (i.e. it absorbs water from the environment/atmosphere).
    Even if you can find the anhydrous form, once the container/packaging is opened, it is difficult to maintain CaCl2 in the anhydrous form due to the above reason.

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    Re: Types of Calcium Chloride

    The Leslie's dosage may be off some. If their product is as shown in their MSDS, then the anhydrous dosage would be correct. So one of the two is wrong -- either Leslie's MSDS or their dosage recommendation.
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    Re: Types of Calcium Chloride

    According to this page http://www.answers.com/topic/calcium-chloride you should be able to distinguish the types of calcium chloride from this information in the MSDS:

    Anhydrous: Molar Mass: 110.98 g/mol, Density: 2.15 g/cm3, Melting Point: 772C, Boiling Point: 1935C
    Dihydrate: Molar Mass: 147.014 g/mol, Density: 1.835 g/cm3, Melting Point: 176C
    Monohydrate: Molar Mass: 128.999 g/mol, Melting Point: 260C
    Tetrahydrate: Molar Mass: 183.045 g/mol, Density: 1.83 g/cm3, Melting Point: 45.5C
    Hexahydrate: Molar Mass: 219.08 g/mol, Density: 1.71 g/cm3, Melting Point: 30C



    If that is the case then looks like most Calcium Chloride products are Anhydrous.

    Monohydrate:
    Dowflake Xtra: 83-87% Calcium Chloride, Melting Point 260C
    http://www.tgrsupply.com/wp-content/...tra%20MSDS.pdf


    Dihydrate:
    Downflake Calcium Chloride: 77-80% Calcium Chloride, Melting Point 174C
    https://ehs.cranesville.com/msds.pdfs/MSDS(D022).pdf


    Anhydrous:
    Leslies Hardness Plus: 94-97% Calcium Chloride, Melting Point 772C
    http://www.lesliesmsds.com/Document/...f5030f1c83.pdf

    Peladown: 90-92% Calcium Chloride, Melting Point 772C
    http://www1.mscdirect.com/MSDS/MSDS0...2-20110714.PDF

    PoolTime CH Increaser: 75-97% Calcium Chloride, Melting Point 772C
    http://www.homedepot.com/catalog/pdf...6ff42737fe.pdf

    Vantage CH Increaser: 90-97% Calcium Chloride, Melting Point 772C
    http://www.vantagewatercare.com/MSDS...reaser_086.pdf

    ChemOne Calcium Chloride: 94-100% Calcium Chloride, Melting Point 772C
    http://www.chemone.com/default/msds/...20Chloride.pdf

    SpaGuard: 75-97% Calcium Chloride, Melting Point 772C
    http://www.thepoolteamstore.com/subp...0Increaser.pdf

    Regal Calcium Increaser: 75-97% Calcium Chloride, Melting Point 772C
    http://www.copooldoctor.com/images/s...0Increaser.PDF

    AquaGuard CH Increaser: 94% Calcium Chloride, Melting Point 782C
    http://www.sfm.state.or.us/cr2k_subd..._INCREASER.PDF

    AquaZone CH Increaser: 94-97% Calcium Chloride, Melting Point 772C
    http://www.aquachemicalsupply.com/PD...eraquazone.pdf


    Is this information correct?
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    Re: Types of Calcium Chloride

    Yes that looks correct. For those anhydrous that list calcium chloride with potentially low percentages of 75%, they might be impure and the large range of 75-97% makes it hard to know how to dose.
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    Re: Types of Calcium Chloride

    Yea thats what I was afraid of.

    Will 95% Calcium Chloride put 95% Calcium in water or is it some other percentage?
    Also 78% Calcium Chloride?

    Example
    1,000 gallons water with 95% Calcium Chloride
    0.0083333333333333333 / 0.95 = 0.0087719 LBS to raise CH 1ppm per 1,000 gallons

    1,000 gallons water with 78% Calcium Chloride
    0.0083333333333333333 / 0.78 = 0.0106837 LBS to raise CH 1ppm per 1,000 gallons
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    Re: Types of Calcium Chloride

    It puts 95% of the weight of product as calcium chloride, not calcium alone. As for Calcium Hardness (CH), it is not measured in weight units of calcium alone, but of calcium carbonate. You can convert from one to the other (though PoolMath does that for you) by multiplying weight of calcium chloride (so 95% of weight of product you add) by (100.0869 g/mole CaCO3)) / (110.98 g/mole CaCl) = 0.9018
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    Re: Types of Calcium Chloride

    More complicated than I thought. Just curious as to how it worked out. Thanks Again.
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    Re: Types of Calcium Chloride

    Quote Originally Posted by chem geek View Post
    For those that anhydrous that list calcium chloride with potentially low percentages of 75%, they might be impure and the large range of 75-97% makes it hard to know how to dose.
    You may already know this but I noticed one of the reasons that it shows a wide percentage range is because the manufacturer will list more than one brand of product instead of just one. One of them may be 75% and the other 97% and/or somewhere in between.
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    Re: Types of Calcium Chloride

    Thanks for letting me know about why there is a range sometimes. I didn't realize an MSDS could cover multiple products. I always thought it was just due to variation they allowed in manufacturing to give them flexibility.
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    Re: Types of Calcium Chloride

    No problem. Surprised I knew something you didnt.
    I would like to post an example but I dont remember where I saw it at or even what chemical. I just remember seeing several brands where the brand name goes in the msds.
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    Re: Types of Calcium Chloride

    I found one.
    http://www.tetrachemicals.com/getFil...ontent_ID=1196
    If link doesnt work go here and click Material Data Safety Sheet
    http://www.tetrachemicals.com/Produc...ETRA_Flake.aqf

    Calcium Chloride 74-100%
    It lists a few different brands.
    Tetra Flake is dihydrate (77%) and Tetra94 is anhydrous (94-97%).
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    Re: Types of Calcium Chloride

    Thanks. That makes sense.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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