4oz. Bird Bath Clear. This product prevents organic contaminates from forming (ie: crusty white scale deposits, iron, copper, hard water stains) using two unique technologies: one helps prevent the buildup of stains, and mineral deposits on the birdbath surface; the second uses bio-enzymatic activity to keep water clear and free from the organic debris that can make the water cloudy. For birdbaths used by birds, small fish, frogs, etc. Environmentally friendly, water based, made with all natural ingredients! Made in the USA.