FWIW, I've been using this stuff for years, the first tank I set up with it was probably in 2003 (ish, I think?) so I can attest to the longevity of it. I'm in WI, and the HD here has it called something like "limestone screening pavers base". I used a screen to pull the bigger chunks out, and ended up with a really fine sand, but I like that in a sand bed. Worms galore. The only thing I've noticed is that some batches appear to be more grey, and some more white. So I always got the bags that were more white.
I was debating about setting up my next tank with this stuff or doing it the "right way" which is kind of how I stumbled on this thread. But I'm happy with it, so I'm leaning towards using it again.