Muck Doctor all natural muck eliminator. Formulated to consume muck and sludge around beach and dock areas. Contains concentrated, safe bacteria that gets rid of pond muck, dead leaves, odors, and other organic material that is harmful to the healthy balance of ponds and lakes. Safely 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, and irrigation. 10 spikes treat approximately 50 feet of shoreline or 250 square feet. Most active in water temperatures above 60 degrees Fahrenheit.