OASE Filter Foam Set for the FiltoSmart 300 - Aquarium Fi...

The OASE Filter Foam Set for the FiltoSmart 300 includes three replacement filter foams. The combination of coarse fine and ultra fine mechanical filtration allows you to meet the filtration needs of your aquarium. It is best to replace the filter foams when you notice a decline in aquarium filter performance. One set includes all the filter foams needed for a full filter change.