$51.99 Amazon.com: Filter Cartridge, Water, 0.5 Micron: Home Improvement
DUPONT 0.5 Micron Rating Water Filter Pitcher Cartridge, 2-3/4 Diameter, 6 Height, 0.26 gpm 
PPF cotton filter cartridge for Water Purifier 2pcs of 10inch PP Cotton 0.5 Micron Sediment 
