How does the carbon work?The carbon helps eliminate odors on contact, so odors are neutralized before they leave the box.Carbon is used as a freshening ingredient in many household items you may already use including: water filters, air filters and fish tank filters.This patented formula has the same cat-activated fresheners and clump strength you expect from Fresh Step scoopable litter. It is just as clean and safe for you cat and home as other Fresh Step litters.