Fluval BioScreen for Fluval C4 Power Filters are used as part of the stage 4 biological filter media and is used to block debris from entering in the final biological filter stage. These are designed with a micro weave core to cover large surface areas and to protect the stage 5 c-nodes from clogging.
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It is recommended that Bio Screens be changed every 1 to 2 months for optimal performance. They can also be rinsed in between replacements to add to your filters life.
Size: 3 Pack