Koiguy, you mentioned this in a previous thread "using 1 submersable, and never having to move it or have it clog...you can do as i do and put your pump by the falls...tee off the pumps inlet to multiple prefilters located around the pond. you draw water from different areas so no dead spots. i have black nylon string tied to mine so i can pull them up near the surface to remove them for the occassional cleaning.....like movable B.D.s" Do you have an inline pump? Otherwise I don't understand the part about teeing off the pump's inlet to multiple prefilters. Basically, I need to move the water around so no dead areas. I do have a small Laguna inline pump that I could put in the skimmer box but run it on a timer. Would that work? Then put the new Laguna 4200 in the bottom of the pond that everything slopes to. I still have the rocks in there but somehow have to figure out how to get them out.