Thinking about making 2 filters for mine. Both 80 gal rubbermaid tubs. Only thing I am unsure of is the wetdry portion. The pond sits ground level if the filters are the level wouldn't it be hard to get a wet dry suspended high enough above to sump for water to drain into it? I see that you have yours hanging over the pond robotto, just wondering how effective it is like that? Anyway I was thinking 2 80 gal rubbermaids with a 300 gph pump in each, and a 500w heater in each, plus a 30 gal wetdry over top of each. Hard to tell, but when I get home I will make a google sketch up of what I am talking about. How big would the inlet/outlets need to be? Still new to sumps.