Marineland's ready-to-use filter cartridges are designed to meet the absolute highest standards of water purification performance and operational ease. Each preassembled cartridge slides easily into place, providing superior mechanical and chemical filtration, and making replacement fast, dry and effortless. The cartridge mechanically filters water through a pad of double thick polyfiber. Debris and waste particles are trapped, and water is chemically filtered through Marineland's Black Diamond Premium Activated Carbon. Inside the 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, no water bypass as with loose or bagged methods. The result? Crystal clear, crystal clean water. "Rite Size C" fits all Penguin® BIO-Wheel 170 & 330, plus the latest BIO-Wheel 200 & 350 Power Filters. Shipping-Weight: 1.5# |