A safe, non-toxic, water clarifier. It is perfect for use in fountains, ponds, waterfalls and self-contained water features. This formula prevents algea and green water and is safe for fish, birds and pond life. Each container contains 20 doses and each dose lasts approximately 2 weeks. Dosage spoon is included. Features: A safe, non-toxic water clarifier Prevents algae and green water Keeps water clean and fresh Safe for birds, fish, and plants 20 treatments per container Dosage spoon included Each treatment lasts approximately 2 weeks Item Specifications: Size: 7 oz.