larry;
a little DE in a sand filter can help get the smaller particles out of the water. (I think it was CarlD who posted a method of adding it to a sand filter- just search for his posts and you should find it) I'm not sure that DE can get it out, without chemical help. There are posts that give you more info, but you'll have to "search" for them, there's something about a trichlor puck, in the skimmer, that is supposed to help.