OK, so I am abandoning my cc ff experiment to go with Ethan style ff. I am wondering about placement since I want to put it behind the waterfall and pipe it back to the pond. That spot is uphill of the water level. Redhotkoi had said "You can place the unit remotely and pipe it over. Mine is 20' away behind my shed/filter house. Can't see it at all except the elbow that returns the water to the pond."
I am wondering how you adjust for the water level in the unit if you have to go downhill to your pond or up and over back to the pond? Just with a ball valve on the end of the pipe? Do I have to dig down to set it at the right level - but then go back up to get it to the waterfall weir?
The only other part of the discussion that I don't get is why the suggestion of a P trap?
SOMEDAY this summer I hope to end up with foam OUTSIDE of my pond!