Interesting isn't it? You never know what reaction you'll get. When I got mine, the guy had no idea that it could be used in fish tanks, and was very interested in learning all about it. So of course I got on my portable soap box and taught him!Jaysee said:When I asked if they had pool filter sand, I then asked to see it (wanted to see the color). He asked why, to which I said I was looking for a particular color. He again asked why, so I said I'm using it in a fish tank instead of gravel. He said he did not recommend it, to which I said "oh, well then that's not what I'll be using it for"