Built this pond 5 years ago for a customer. Not my pond.
Was there today for cleaning so I took a few pics.
Filtration two vortex chambers with brushes. 1/4HP dragon wave pump. 6 cuft of media in the waterfall box. 120W UV.
The owner lost over $3000 worth of koi in one day from a blue heron visit. Since all the kois are big now I've advised them to remove it but they don't have a warm fuzzy doing it. They also put up the arched patio partly over the pond because someone told them that heron will not go under structures. Someone made some money on that...haha