I use it all over the place. You will be rinsing while you stir for at least 15 bucket changes. If you fill a bucket halfway with the stuff out of the bag, you'll be washing away at least 1/3 of it as silt. But it's great stuff for deep sand beds, since you can rinse it less and leave lots of finer particles in there to compact and go anaerobic at sufficient depth. Looks so natural, too.