We used to buy huge amounts of Arm & Hammer for the pool. I wish I could remember what show it was, when, but I once saw a TV show where they used various soda products to make Irish soda bread, just to see if anyone knew the difference. Everything from pool products to kitty litter sanitizer. If I remember correctly, the kitty litter sanitizer was the favorite bread. The fact is if it is soda and only soda, I guess there isn't that much of a difference. At any rate, where we lived many people had pools and we simply bought the very same soda you cook with, only in larger boxes. I cooked out of the same box.