Product Description The D-10A Basic drinking water cartridge provides 3 months/ 250 gallons of refreshing drinking water by reducing chlorine, particulates, and bad taste. The D-10A is compatible with the following systems, US-550, SY-2000, SY-2100 and US-600A. From the Manufacturer Culligan D-10 carbon-impregnated cellulose cartridge 2 pack reduces chlorine taste, bad taste, and odor. Filter life up to 3 months or 250 gallons and fits US-600. The filter is a 5-micron (nominal) filtration cartridge to reduce sediment and dirt. This filter is ideal for undersink filter applications.