The Bio-Dex AP132 Aqua Pure Algaecide 1 Quart is a formulated Alkaline copper quaternary which helps in eliminating all forms and colors of algae. This chelated formula prevents copper staining which is most common when using other copper algaecides. One bottle is recommended per 20,000 gallons of water for initial use against visible algae growth in pools. This item comes in a 32-ounce or 1-quart bottle. Care should be considered when using this product by using your own goggles to protect your eyes and gloves to protect your hands from unnecessary incidents.