SeaKlear 1-Gallon Reliable Nonstaining 90 Day Algae Prevention and Remover

When used according to instructions in balanced pool water, you'll have no algae guaranteed for 90 days Effective for killing and preventing blue-green, green, yellow and black algae Prevents algae growth without foaming or staining your pool structure Made with 11.8% copper sulfate pentahydrate, with 3% copper as elemental Compatible for pools in order to maintain clear water and kill algae Color: Blue Dimensions (L x W x H): 3.2 x 3.2 x 9.5 inches Weight: 9.2 pounds