Quote Originally Posted by Shifty View Post
No DE has blown out the returns. It is stuff like bugs and pieces of leaves. As far as I can tell, I don't see anything besides water coming out the returns. The only time I saw something other than water come out the returns was when I apparently put granular CYA in the skimmer too quickly and some of it came out the returns

Do you have a multiport valve? That sounds a LOT like a multiport valve failure.