The CA-SE 10 HF-U BX 0.02 micron is a cartridge with an activated carbon block. Carbon is the key ingredient in making your water taste good, free from chlorine, and bad odor or taste. Coconut shell carbon is one of the highly efficient types of carbon media.
This cartridge does not only include carbon filtration but also has a mechanical layer that removes dirt of up to 0.02 microns. This micron count is extremely small and is used in very specific industries.