Basements. Garages. Attics. All places prone to nose-crinkling odors. And all perfect locations for Fresh Wave Odor Neutralizing Crystals. Just open the jar and eliminate odors – it’s really that simple. The 15 oz. jar is perfect near a cat little box or tucked in the corner of a gym locker. It’s odor neutralizing power lasts for 30 to 90 days and can be easily be refilled with the 64 oz. jar. With 4 refills in the container, it’s a great value!