Specially-structured coarse filter medium for trapping solid dirt particles. EHEIM FIX (EHFIFIX) is used as effective mechanical filtration at the water inflow of the filter as second layer (e.g. after EHFIMECH). It is also ideal for use in overflow chambers. The material can be washed out under cold water and can be used several times. To be used in fresh and marine water.Do you have questions about this article ?