Effective filtration for ponds up to 1000 gallons. Provides mechanical and biological filtration (bio-media sold separately). Easy to install and blend into landscapethis innovative filter can be used with pumps ranging from 500 to 4500 gallons per hour. Great idea for secondary filtration for ponds in excess of 1000 gallons. Adaptors for 1" and 1 1/4" are included.