How Do Septic Tanks Work?

Often we see septic tanks – large, commonly cylinder-shaped objects placed strategically to the side or back of properties, but rarely do we stop to think about their purpose or function. Inside these vessels, intricate and complex processes are occurring to turn wastewater (water that drains from toilets, showers, baths, kitchens and laundries) into a pure and useable resource. In the total weight of wastewater, waste contributes just 0.1% – this serves to demonstrate how little of what makes it way into septic tanks can be considered waste. It also serves to demonstrate how easily waste water can be salvaged into a clean and safe resource through the activation of two processes within a tank:

Solids (solutes) move down a gradient – which basically means that they try to produce an equal concentration throughout the whole solution. To help visualise this, an example can be given of food colouring into water; at first the colour particles sit at the top, but eventually they start to trickle down – this is a solute attempting to even out a solution. This basic chemistry is very helpful in treating water, as waste sinks to the bottom of the tank where is it then digested by bacterial microorganisms.

This digestion allows for oil and grease to rise to the top of the tank, where it creates a protective layer or a crust over the liquid; this prohibits the entry of air into the tank and allows oxidation by bacteria to thrive. Water is then made free of waste and waste particles and can continue on its path through the many treatment phases and filters inside the tank.Septic Tank

How does this process make wastewater safe for reuse?

For starters, wastewater tanks are not just constructed without thought. The science necessary for each stage of treatment is thoroughly considered and tanks are built precisely for such purposes; many structural and safety requirements are mandatory before a tank can be made available for sale.

Secondly, water goes through many filtration stages before it is finally exposed to a disinfectant (for example, chlorine, chloramine). This destroys any remaining parasites, bacteria, and viruses, ultimately protecting the water from germs before it is once again available for use.

EcoSeptic have been in the business of water treatment for many years. To say that our staff are knowledgeable and capable is an understatement and we are confident that the instalment of a water tank will be a positive step for your project, property or facility. For all these reasons and more, it is important to consult with Eco-Septic professionals to ensure an accurate and custom maintenance plan for your septic tank. If you like to find out more about Eco-Septic, Please Contact us today for a fast quote today. Visit us at or call us on 1800 808 135.

We provide many different styles, options and maintenance services and our services cover all Sydney suburbs, Southern Highlands, North and Mid-North Coast, South Coast, Snowy Mountains, Blue Mountains and Hawkesbury, Riverina, Laguna, Narooma, Bateman’s Bay, Nowra, Cobargo, Mallacoota, Moruya, Mogo, Dural, Glenn Ines, Werrington, Balmoral, Kenthurst, East Kurrajong, Lowe MacDonald, Braidwood, Grose Wold and the surrounding areas.