Spa Frog's Filter Frog provides spa and hot tub owners with an effective way to reduce their systems sanitizer consumption while improving water quality, simply by placing this product inside a filter element. Filter Frog uses silver and copper to naturally kill bacteria without the need for harsh chemical treatments. It improves your bathing environment by reducing natural and chemical odors, as well as reducing skin and eye irritation. The Filter Frog simplifies spa maintenance and reduces operating costs by stretching your sanitizer much longer than normal.