What do you think of this set up? With a 1500 gallon pond, a 3,500 gph pump and a 25ft stream from the biofall filter to the pond, I have folded over a piece of window screen near the end of the stream to work as a filter. It is filtering 3,500 gph. I have to remove the screen and hose it off in the morning and evening. Each time it is loaded with alge and gunk.