PURGGO eliminates odor. The bamboo charcoal inside is 4x more porous than regular charcoal and acts like a big sponge that traps odor particle, which purifies the air in your car. You've got better things to do with your time than buying refills. Give yourself peace of mind, knowing PURGGO is all natural and completely safe to use around your family and pets. It's also fragrance and scent free.