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Hagen Fluval 206/306 207/307 Bio-Foam - 2 Pack
Effectively removes particulate matter mechanically.
Also allows thriving populations of beneficial nitrifying bacteria to aid in the establishment and maintenance of the biological balance in the aquarium.
Suitable for both freshwater and marine aquariums.
Periodically rinse foam inserts in lukewarm water. Replace bottom foam insert every three months for maximum biological efficiency
Suitable for Fluval 206/306 and Fluval 207/307 aquarium filters.