This refillable room freshener is a nonelectric moisture absorber to protect against damage caused by excess moisture. Absorbs musty odors caused by stagnant air. Nontoxic, septic safe, and friendly to the environment. Ideal for smoke, trash, paint, pets, diaper pails, and food odors. Open bag and pour crystals into canister. Crystals will harden and dissolve as they absorb moisture. Fragrance Free and Lavender Vanilla 42 oz. refills available.