[rashr]

I have recently aquired a 50 lb bag of calcium chloride that was used at our site for ice melt. It says it is 80% with the remaining 20 % being magnesium cholride (10%) sodium chloride, potassium chloride. Can I use this to help keep up my calcium levels in my tank with out danger? Seeing as all of the above are needed I didn't see where it would hurt anything, but I am always just wary if it doesn't come from a fish store. I now use magnesium chloride from an ice melt and baking soda for my alkalinity (both scared me at first). I know what they (fish stores) use is what we can find at the grocery and hardware store allot of times, but it still scares me some knowing my investment is in my hands and they are shaking! Any help would be helpful!