this Pond was built40- 50 years ago before I bought my house. I had it running years ago but it leaked badly along the run, This year I Rubberized it with 4 coats and it is good to go! I have three 8" koi assorted plus assorted goldfish and a decent sized bullhead. The water falls behind and spills out on both sides...pretty cool design. The pond is 9.5 foot circle aprox 22 inches deep. 750 gallons or so.......I have a laguna submersible filter with 13watt UV running and a seperate 900gph pump running the falls.