Formulated for outdoor birdbaths or fountains. Choose the Birdbath Protector for water sources that contain approximately 2 gallons of water or less. Choose the Fountain Protector Formulated for fountains that contain 3-10 gallons of water. 8 oz bottle. Prevents stains, organic contaminants, mineral deposits. Keeps water clean and clear naturally. Safe for birds, wildlife, and pets that may drink from the birdbath. Non-toxic. Made in the USA.