We are often asked if our sewage treatment plants need bacteria to be added to them to work properly. The short answer is no. The majority of companies that supply these products offer no guarantees and no independent certification for their products.
Adding bacteria to a septic tank system is pointless. A septic tank system is an anoxic settlement tank [low levels of oxygen]. Bacteria need oxygen and food to survive and flourish. Adding bacteria to a tank with minimal oxygen levels means the bacteria will perish rapidly and will achieve nothing.
With an aerated sewage treatment plant, within the space of 2-3 days after startup, a full colony of naturally occurring bacteria will have developed in the system. The bacteria population is limited by the food available [i.e. the incoming sewage], so adding bacteria to a tank that already has the maximum population of bacteria present has no positive impact.
Our advice – buyer beware!