How A Septic Tank Works? by septictank How A Septic Tank Works? Did you know that if you are not connected to mains drainage then you need a septic tank and soakaway? What is a septic tank and soakaway? All houses produce wastewater. Wastewater comprises of bath water, toilet water, sink water, shower water, washing machine and dishwasher water e.t.c In many towns and cities, houses discharge their wastewater into the mains sewer. A large sewer pipe that is buried under the road, and from there eventually makes its way into a sewage treatment processing plant. A house that is not connected to the mains drainage must have a septic tank and soakaway. A septic tank is a large underground tank that has an inlet pipe and an outlet pipe connect to it. Septic tanks come in many shapes and sizes. The size of the septic tank is based on the number of occupants in the house or it is based on the number of bedrooms in the property. The soakaway is also known as a drainfield or leech...