Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Play sand is bad. Too many fines, even if you rinse it. Remove it.
PFS is the way to go if you want sand substrate.
Even coarser sand and similar materials work well, too. You want a graded product so pretty much all the particles are the same size. Some rinsing will help because in the bag some particles may break apart, there will be some dust, but it is nowhere near the amount of dust that you find in most play sand.
Where do they get that idea, anyway? If I was building a sand box for my kids to play in I would want a coarse sand that falls off just by brushing it off. Not that fine stuff, almost like flour.