Marineland Emperor Ready-To-Use Filter Cartridges, Pack of 2

Marineland Emperor Bio-Wheel Power Filter Cartridges are designed to meet the absolute highest standards of water purification, performance and operational ease. Each replacement cartridge is pre-assembled and slides easily into place, providing superior mechanical and chemical filtration and making replacement fast, dry and effortless. Debris and waste particles are trapped, and water is chemically filtered through Black Diamond Premium Activated Carbon. Inside the cartridge, a patented ribbed backing ensures even distribution of activated carbon to deliver maximum water-to-carbon contact. The result is crystal clear, clean water. Features convenient, color-coded Rite-Size packaging to make it simple to choose the right replacement cartridge. For best results, change every 2 to 4 weeks. Clean, sparkling water is the mark of a healthy, thriving aquarium. The amount of filtration needed to maintain an aquarium depends on a number of variables.