Powdery zeolite containing active agents for red tide prevention

PURPOSE: To prevent red tide economically and efficiently, provided is powdery zeolite containing active agents for red tide prevention by spraying that to sea area in red tide. That also can prevent suffocation of fishes in a nursery and reduces secondary damage to submarine environment. CONSTITUTION: The powdery zeolite is manufactured by mixing colloidal zeolite suspension 1L with 1-5000mg of active agents such as HOCl or OCl¬-. The colloidal zeolite suspension is manufactured by dispersing zeolite powder 100-20000 mg in seawater 1L.