Selling because my 90gal sprung a rear seal leak :( this filter is unreal, 1st layer: foam and filter floss 2nd layer: charcoal and filter floss 3rd layer: bio material with filter floss. MODEL: EFU-35 - flow rate: 250GPH - tank size: up to 150 GAL - 100v/60Hz TEXT OR CALL, email if needed... Any other questions feel free to ask.