Prevents contaminants from forming， such as crusty white scale deposits， iron， copper and hard water stains. Uses two unique proprietary technologies. One system helps to prevent the buildup of stains and mineral deposits on the birdbath or fountain surface. Helps keep birdbath water clear Natural and safe biodegradable and environmentally friendly as well as safe for humans and pets Prevents organic and inorganic contaminants from forming Keepers birdbath water clean and clear for use by birds， small fish， frogs， and more 4 oz bottle provides 17 treatments Liquid Cleaner Made in USA Your security is our number one concern