I think what you are going to find is commercial lime often contains impurities, e.g., silica, iron, alumina, and magnesia. If you can find a bag that has a guarenteed analysis your ok.
the stuff you are looking at looks like a left over hog pog of chemicals.. one concern I have is that Calcium carbide reacts with water, releasing acetylene. could get a lottle flamable around the tank
Steve
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