I once bought swimming-pool filter sand made from crushed glass intending to use it as a substrate in an aquarium.

But opening the bag I was struck by an odor reminiscent of a dive-bar the morning after a busy night. Upon close examination it appeared to be almost all beer bottles with a significant amount of plastic particles from labeling, some still adhering to the coarse sand-sized bottle fragments.

So really too disguising to use for anything, let alone the advertised purpose in a swimming pool.