Septic Treatment

Untreated household sewage would quickly clog any soil structure if applied directly to the soil. So the function of the septic tank (also known as a primary treatment unit) is to act as a settling tank, allowing solids to settle to the bottom of the tank with fats and grease floating to the surface. The middle clear zone allows for draw off into a secondary chamber.

Modern septic tanks generally include a bacteriological filter. Septic tanks may have one or two compartments with an additional chamber for a discharge pump. Sizing of septic tanks will vary depending on:

  • Design engineers and council specifications
  • Soil types and level of treatment specified by engineer
  • Number of bedrooms and sizing of dwelling