Marineland® Biological Filtration Bio-Filter Balls provide larger, multi-faceted biological filtration area for the growth of beneficial BIO-Spira® bacteria.These Bio-filter balls fit all C-Series and Magniflow® canister filters. Each pack contains 90 pieces.

• Provide larger, multi-faceted surface area for support of biological filtration
• In the event of excessive buildup, you may gently rinse with water from an established aquarium
• Do not clean with soaps or abrasives and never rinse with unconditioned tap water