Any type of large-scale composting system used to breakdown biodegradable organic material using machine blowers and pipes to provide air circulation. ASP composting facilitates decomposition by pushing or pulling air through the pile. Piles are created in a trapezoidal shape and receive little to no mechanical turning. Bulking agents, typically wood chips or shredded newspaper, are added to the pile to enhance the flow of air and add porosity to the pile. The method is often used for wet materials and large volumes of feedstocks.