EHEIM filter pads are used to separate
the different filter media layers in standard filters. The coarse filter pad is
layered between two types of biological media to help remove particulate matter.
Over time the filter pad will not only act as mechanical filtration but also as
Insert into EHEIM Classic filter 2217 above the bottom layer of media (such as
Ehfimech) and then place a second type of media (such as Ehfisubstrat) on top of