Marineland Bio-Wheel Penguin Power Filter Cartridges provide premium activated carbon for efficient mechanical and chemical filtration, keeping your water crystal clear and clean. Rite-Size C cartridges are easy to replace and designed for maximum water contact.
Inside the filter cartridge, a patented ribbed backing ensures the even distribution of activated carbon to deliver maximum water-to-carbon contact. There is no "tea bag" effect and no water bypass as with loose or bagged methods. Contains Marineland Black Diamond Premium Activated Carbon.
For best results, change cartridge every 2-4 weeks.
Fits: Marineland Penguin Pro 275 and 375 Power Filters.
Rite Size C Filter Cartridge Dimensions: 6.5"L x 5.8"W. Filter Cartridge Placement: Black plastic side faces the front of the filter, blue side faces back.