I got yelled at for making a mess in the kitchen (I live in an apartment and have no garden hose.), so I only spent about an hour cleaning my 50lb of play sand and it took 3 days to clear up in the tank. I also spent an hour cleaning about 30lb of medium sand, which I really think is PFS, but sells for $3 a bag instead of $8, and the tank never clouded. I really think I could have gotten away without rinsing the medium sand, but better safe than sorry.