CarbonPlus filter is a commercial-grade carbon block filter that filters down to 0.5 microns and is the standard filter for the ION Water Cooler. Most IONs are shipped with the CarbonPlus filter unless otherwise specified on the back of the ION. Made from the highest quality coconut shell carbon and encapsulated within the patented EZChange Housing — the convenient and sanitary way to change filters. Just twist to remove, with no tools and even without turning off the water supply. CarbonPlus is highly effective at reducing Chlorine, Taste, and Odor. CarbonPlus contains proprietary media for lead reduction, and is certified for reduction of cysts, including Cryptosporidium and Giardia and is certified by the WQA to NSF/ANSI 42 and 53.