203 Foam Block 2-Pack Fluval A-1432 By Hagen Fluval
Fluval 203 Foam Block 2-Pack (Fluval A-1432) for all Hagen Fluval 203 filters
For freshwater and marine environments
The Fluval Foam Block filter insert effectively removes particulate matter mechanically. It also allows thriving populations of beneficial nitrifying bacteria to aid in the establishment and maintenance of the biological balance in the aquarium.