Specially designed filter media for Fluval's superior performance FX5 and FX6 canister filters, carbon-infused foam blocks trap microparticles in the water as it passes through.
The presence of carbon eliminates odors, elements altering the color of the water, heavy metals and organic contaminants.
Foam blocks protect the aquarium filter motor by trapping debris
Charcoal eliminates odors and keeps water clean and crystal clear
For freshwater or saltwater aquariums