PBF Filters on a Private Koi Pond in Upstate New York (Filters) Koi & Home Pond, Propeller Bead Filter Filtration for a private greenhouse koi pond in upstate New York consists of multiple Propeller Bead filters. Skills Posted on December 29, 2015 ← PBF Filters on a Private Koi Pond in Upstate New York PBF Filters on a Private Koi Pond in Upstate New York (Alt) →