Penguin 160/170 300/330 200B/350B Cartridge Rite Size C 3pk (Marineland)
Each preassembled Penguin Cartridge
filters water through a double thick polyfiber pad which traps more dirt and
debris, faster. The cartridge is packed with super-efficient pure Magnum
Activated Carbon...it keeps working long after most carbons stop. It's better
than a bag! Just shake and rinse. The patented ribbed backing evenly distributes
carbon for maximum water to carbon contact. No bypass, no "tea bag"
effect...just crystal clear, crystal clean water.