Muck DoctorSafely breaks down muck and dead vegetation Super charges naturally occurring bacteria to consume micronutrients for a healthy, clear pond 100% safe for humans, fish, livestock, pets, birds, swimming, consumption and irrigation 1 box (10 spikes) treats approximately 50 feet of shoreline or 250 square feet. Most active in water temps above 60F. Muck Doctor, muck removal, is specifically formulated to reduce muck and sludge around beach areas and docks.