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Waste water aeration is a process where waste water is mixed in order to induce a biological process. It also keeps the solids in the waste water floating to allow a more effective water treatment. There are two methods used in aeration systems: one is the use of a mechanical surface aeration where air is infused through agitation and the other method is through the introduction of air or pure oxygen using diffusers submerged in the waste water... The biochemical process resulting from aerating the waste water system encourages the development of "aerobic bacteria" which are more active "eaters than the anaerobic bacteria. This kind of bacteria needs air to survive however and this is the reason why aeration systems are designed to bring air in the sewage or septic tank. With this biochemical activity in place, the aerobic bacteria will clean up the fluid in the septic tank and will also make the way in the same process to the lines of the leach field or the septic drain fields...