Eheim filter fleece for Eheim filter media boxes has a special structure and forms one step in the staged water-cleaning process. The water permeates the fleece evenly, and it removes small and large dirt particles mechanically. As it has a long useful life, this special filter fleece is colonized by filter bacteria, which break down organic pollutants in the water very efficiently.
The filter fleece needs to be cleaned or replaced when the filter output decreases noticeably.
For Eheim aquaball 2208, 2210, 2212, 2401 and 2403