Hi Reggie,
I'm about to try using pool filter sand in some of my
tanks. Supposedly it is pretty much pre-washed, so
that people can use it to filter their pool water.
I'm not sure, but I bet it's unlikely to alter water
chemistry too much, since pool people are worried
about that, too. I paid $7.99 at a pool supply store
for a 50 lb bag. I've used play sand in the past, and
I have to wash it a gazillion times, it's so muddy.
Also, pool filter sand is a slightly larger grain than
play sand, and is supposedly all the same grain size.
Does anyone have any experience with this material?
-Laura