Chad Horn, if you are thinking the floc from the alum treatment is causing the "cloud", the floc will be about 1/4" thick or less.

When I did my own DIY diffusers, I made pods of 3 diffusers in a triangle shape and mounted them on a 2' x 2' galvanized oil drip pan so current would not erode soil and let the diffuser pods "dig a hole".