yes, many of the sidewalk salts are or contain CaCl2. "Road Runner" is the only brand carried by Lowe's and Home Depot where I live, and it seems to be mostly Sodium, and also contains Potassium and Magnesium Chlorides in addition to Calcium Chloride. If you're already dosing potassium, you might want to keep an eye out here, as well as the high sodium content... could reek havoc on your electrolyte balance (some fish really don't like too much sodium). I suppose I should email the people that make "Road Runner" and find out the approximate ratios of each salt. This *could* be a very cheap answer to reconstituting RO/DI, rain, or distilled water, or mixing up high GH water for hardwater fish. I'll get back to you all on that issue, possibly in a new post (I'll be sure and link to it here).
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