Simply shovel stools into the system, occasionally add water and the Digester Powder. Neat, clean, and convenient. An environmentally friendly way to dispose of pet waste! Each unit comes with a starter 6 month supply of Digester Powder. The Digester Powder is a non-toxic, harmless mixture designed especially for pet waste. The systems are harmless to pets, lawns, and shrubs. The Doggie Dooley is an excellent way to dispose of pet waste safely and control odors. Works well in all soil conditions except in areas with hard, non-draining clay soil.