Finnpond - the guy talked us into a Tsurumi 5500 gph pump (submersible)... way to strong for me. :'( I wanted a calming effect, not raging rapids
My husband put in a restricter that slows it down to more of what we like.
The pond is 11 x 16 with an 8 foot stream about 24" high, Savio skimmer... let's see what else did you ask me, no bottom drain (wasn't planning on koi, but now i have some
) Biofalls filter with media and a drain. The pond holds about 1,750 gallons.