Dye Tracer Powder, Dye Type Water Tracing Dye, Color Blue, Form Powder, Container Size 1 lb, Coverage 120,000 gal (Strong Visual), 1,200,000 gal (Light Visual), Dissolution Time 3 to 6 min, Detectability less than 100 ppb, NSF Certified Yes, Fluorescent No, Application Cooling Towers, Flow Studies, Lakes, Rivers, Ponds, Leak Detection In Large Closed Loop Systems, Power Plant Piping, Sewer and Drain Connections, Standards ANSI; NSF