All of this is relevant because high quality compost can be made quickly with frequent turning or slowly with less frequent turning. The more frequently piles are turned and mixed, in general, the greater the availability of food, air and water, and the faster the rate of microbe growth. Microbe growth and composting will occur with less turning, but it will take more time. A minimum pile size (usually 3’ x 3’ x 3’) is necessary to obtain adequate heating. In very large piles, pipes or tubes like 4” plastic drainage pipe available for about $20/100 feet may need to be added to provide adequate aeration. Placing them on an angle so that warm air rises and creates a draw helps pull more air through the pile.