I use the Fluidized Bed Sand Filter (model FB-900 by Pentair), it can handle overstocked fish or up to 900 gallons. Cost is right at $100. For waste I use Marineland Magnum 350 filters Ebay about $85). Rainman - Do you hook up your FB-900 up to your Magnum 350's outflow, or do you run the FB-900 on its own powerhead?
12 ac pond in NW Missouri. 28' max depth at full pool. Fish Present: LMB, BG, RES, YP, CC, WB, HSB, WE, BCP, WCP, GSH.
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