Compost Aerator Decomposition Aide The decomposition occurring in the compost pile takes up all the available oxygen. Aeration is the replacement of oxygen to the center of the compost pile where it is lacking. Efficient decomposition can only occur if sufficient oxygen is present. Turning the compost pile is an effective means of adding oxygen and brings newly added material into contact with microbes. Unique design Helps aerate and circulate compost Extra durable, all steel construction Mixes compost without the use of a shovel Folding wings harpoon into the heart of the compost pile Ships Quickly!