Da Maui life
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Question on Randy's two part calcium and alkalinity supplement system. If the calcium chloride dihydrate (flake) is 99% verses 77-80% such as Dowflake do any adjustment needs to be made, ie 500 grams (about 2 ½ cups)
Randy's two part calcium and alkalinity supplement system
- Thread starter Da Maui life
- Start date
Da Maui life
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Okay thanks... Dowflake is not available locally so I’m looking online, this is calcium chloride in question. http://www.amazon.com/gp/product/B00H9UT46K/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1YODDMX8F1BE8
I'm confused.
100% calcium chloride dihydrate is about 76% anhydrous calcium chloride and 24% water.
Do you mean 99% calcium chloride, or 99% calcium chloride dihydrate?
Da Maui life
New member
I'm not a chem guy, so I can only go by what the seller has on Amazon. Please see link above "Calcium Chloride Flakes 99% Pure (CaCl2)"
Da Maui life
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The description confused me, I think it's just calcium chloride dehydrate?
The linked product looks to be anhydrous. You'd use 20% less by weight, which is likely about 20% less by volume than my recipe. 
Last edited:
Da Maui life
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Customer Reviews
1 of 2 people found the following review helpful
Not the anhydrous form
By Amazon Customer on February 1, 2014
Verified Purchase
The description suggests that this is the anhydrous form and this form which can be used as an excellent desiccant. However this is the dihydrate.
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If you buy it, we can determine which it is by whether it gets warm when dissolving in a small amount of water. Anhydrous does that, the dihydrate does not.
Da Maui life
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:thumbsup:Thanks for the help Randy.
Da Maui life
New member
I have it on order as well. just do what Randy has above "whether it gets warm when dissolving in a small amount of water" and you'll know, if it's anhydrous or dehydrate.
http://www.reefkeeping.com/issues/2006-02/rhf/
http://www.reefkeeping.com/issues/2006-02/rhf/
I have some Anhydrous Calcium Chloride that I purchased from a different vendor (Canada Reef Supply), and wow does it get hot when mixed. Scary hot.
I was using some thin plastic containers from the dollar store because I liked the size and features of them (wide mouth screw on flip up lid). The container deformed in a heartbeat. Needless to say I now use a more robust microwaveable canister as my mixing/dosing jug.
Dennis
I was using some thin plastic containers from the dollar store because I liked the size and features of them (wide mouth screw on flip up lid). The container deformed in a heartbeat. Needless to say I now use a more robust microwaveable canister as my mixing/dosing jug.
Dennis
Da Maui life
New member
The Amazon product mentioned in my post appears to be anhydrous Calcium Chloride I have tested a spoon full with a small amount of water and it got pretty warm (undissolved) before I dumped it out.
