K-Tea algaecide is the best choice for eliminating standing or slow-moving water of unsightly and troublesome planktonic and filamentous algae. Enjoy the performance and application flexibility K-Tea offers as well as the minimum restrictions for its use on a broad spectrum of algae, including Cyanophyceae (blue-green), Chlorophyceae (green), Diatomaceae (diatoms), and Protozoa (flagellates). K-Tea is a copper-based product that has been proven effective with years of use. It works best when applied at the first signs of algal blooms. A unique set of features makes K-Tea a distinctive algaecide with unmatched benefits. Effective even in hard water. May be tank-mixed for broader control. Active ingredient: Copper as elemental (derived from Copper-Triethanolamine Complex and Copper Hydroxide) Info from SePro