We must admit it, bacteria are better experts than engineers when it comes to sewage treatment. Without bacteria, individual sewage disposal systems and sewage treatment plants would not be able to do their job.
Sewage is a delicacy for bacteria.
It is their favorite dish. They are extraordinary little critters which are designed to perfection and will not leave any waste behind. During the digestion process, they transform the leftovers to carbon and water. Clean, clean and clean is their goal in life. The role of bacteria in a sewage disposal system is a French discovery.