ThinkBamboo 180g Bamboo Charcoal Pet Odor Absorbing Pouch - 7pc Blue 7 Granulated Bamboo Charcoal Odor Absorbing Air Fresheners. Trap and destroy pet odor - Blue. Instead of masking odors with perfume, these air-fresheners work by trapping odors. Lay on top of kennels, cages, or the mesh lids of aquariums to absorb and destroy pet odors. Re-usable, to recharge the odor absorbing and destroying power of the bamboo charcoal, simply lay the filter out in bright sunlight. These air fresheners each measure approximately 6" X 5" X 1 1/2" and contain 180 grams of Bamboo Charcoal.