Searles Path Weeder RTU is a great spray for use in outdoor situations, providing instant and long-term control of un-wanted weeds and grasses in paths and paved area. This product contains 3 different active constituents, that when combined provide a powerful solution to unwanted weeds in outdoor areas. When spraying affected areas, for effective control do not apply if rain is expected within 24 hours. Active Constituents: 9g/Lt Simazine, 5g/Lt Amitrol, 4.4g/Lt Ammonium Thiocyanate