So again we took the filter apart and squirted it off. Seems most of the DE was at the bottom and not on the grids. Again the grids were covered in green gunk. Not sure what is happening. We put it all back together, put 4 more lbs. of DE in and this time used a skimmer sock while vacuuming the pool. We had to empty/clean it 3x's before we were even done with the pool. It was loaded with brown/greenish dirt and seeds from the tree. The skimmer sock really seems to be doing the trick because the suction is great and the return is really moving the water well finally. I'm still a little concerned about the DE not sticking to the grids so maybe we need to soak the grids in muriatic acid like I've seen other people post. What again is the purpose of that?