Culligan D-40 Drinking Water Replacement Filter Cartridge CULLIGAN D-40 UNDERSINK FILTER CARTRIDGE REPLACEMENT FACTORY SEALED CARTRIDGE FITS MODELS US-550; US560; US-600 AND CTR-210 SPECIFICATIONS: STANDARD 42/53 IN MODEL 5 MICRON FILTRATION REDUCES LEAD/MURCURY; LINDAINE; ATRAZINE; CARBON BRIQUETTE; BAD TASTE; ODOR; SEDIMENT; CHLORINE; GIARDIA & CRYPTOSPORIDIUM; ASBESTOS; FILTER LIFE UP TO 6 MONTHS OR 600 GALLONS ULTRA FINE FILTRATRATION CARTRIDGE LIFE DEPENDS ON THE QUALITY OF YOUR WATER