Safe for wildlife & the environment, carefree enzymes birdbath protector is a weekly treatment that uses all-natural enzymes to clean & clarify birdbath water. Preventing stains & Mineral deposits while breaking down residue & organic contaminants, This bird fountain Water cleaner is formulated for outdoor birdbaths that contain approximately 2 gallon of water or less. Its food grade enzymes are nontoxic & bacterial... So they're safe for all surfaces, & won't harm bathing Birds or thirsty pets. Just one cap Full weekly helps keep birdbath clean & clear 4 oz.