Dam Stop Leak Standard is a potassium-free polymer/clay sealant that creates a permanent plug in any leaks or cracks of an earth or clay-based dam. No need to drain the pond or dam, simply apply the required amount directly into the water over the affected area, or treat the entire waterbody, to achieve long lasting results. Dam Stop Leak Standard will fix the hole in your small dam, pond, or hobby dam, without leaving a hole in your pocket. Dam Stop Leak Professional is environmentally safe and non-toxic. It is safe for use around fish, other aquatic animals, plants, wildlife, pets, and livestock.