The only thing that I'd change on Cecil's system is the intake. I found that leaving it on the bottom of the pond in a bucket would eventually suck up enough sand to clog the intake pipe. I fixed that problem by floating the suction end inside a rather large innner tube. It kept the suction screen near the top of the water.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).