Am I the only one who hasn't had a great experience with blasting sand? I got the stuff from menards that Econde is talking about, and I really wish I didn't have it anymore. Thankfully I'll be moving in a month and can remove it when I drain my tank.
It's in my 90gal goldfish tank, and it's a pain to vacuum. Granted, all the poo sits on top, which is nice, but even then it's so fine, I end up sucking so much sand through the python, which isn't great for the hose or the pipes. One of my goldies (a rescue) has had a problem with bottom sitting, and I'm not sure if it's the sitting in general or the sand, but his belly gets pretty scratched up. I have to float him in a colander just to give his tummy a chance to heal up. I wonder how fish like corydoras do good.
Maybe if I had found some that wasn't so fine it would have been better, and my case is obviously not the norm!
As far as rinsing though, I filled up a bucket and constantly had hot water running over it with my hand in there swishing the sand. You can either dump the water and repeat, or just let the water continually overflow the bucket, it'll run clear eventually.