EHEIM Filter 2618080 is suitable for filters Aquaball, Biopower and Prefilter 4004320.
Even after a short running-in period, the foam cartridges provide not only for mechanical water clarification but also provide big surface for good bacterias to develop. The cartridges can be used several times. For cleaning, you should only rinse them so that the bacterial cultures are not completely destroyed.
The package contains 2 pcs.