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How Does A Sewage Treatment System Work?

What is a sewage treatment system?

Sewage treatment systems are a special device that treats wastes water in an environmentally sustainable way. The water produced from a sewage treatment system is able to be used on gardens and grass to keep them luscious and green all year round all while not adding to your water bill.

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How sewage treatment systems work

There are 3 main stages to sewage treatment systems with each being just as important as the next.

The first stage in the sewage treatment is the Primary chamber. This chamber contains all of the grey and black water from the home and holds it until the heavy materials fall to the bottom and the lighter material floats to the top. Once this process has occurred the left over water (effluent) then leaves the tank and proceeds into the secondary chamber which is known as a pre-treatment chamber.

In the second chamber wastewater is subject to special anaerobic bacteria which feeds on the pollutants within the water and starts the breakdown process.

Fact: Anaerobic bacteria does not need oxygen in order to survive and feed.

The second stage in the treatment is called the aeration chamber. This chamber creates small bubbles which aerate the chamber causing oxygen to transfer into the water which allows for aerobic bacteria to grow rapidly. This bacteria is a lot faster at breaking down organic waste than anaerobic bacteria is as well as being able to double its numbers when there is a food source such as organic waste.

Fact: Aerobic Bacteria requires oxygen to live and in turn is able to consume and breed faster than it's anaerobic counterpart.

The third stage of the process allows for the waste water to settle. The water within the chamber at this point is now lighter and less dense than what is was when it entered the system. The aerobic bacteria will settle to the bottom if not disturbed. Chlorine or UV light will be introduced at this point to remove any unwanted bacteria from the water.

The forth and final stage is when your wastewater is pumped out of your hose or irrigation system onto your garden or lawn.

Sewage Treatment System Brands

There are many different sewage treatment manufacturers. Some common brands are:

Your local sewage treatment system specialists

If you would like more information on Sewage Treatment Systems or would like to know more specifics about your current system then get in contact with us. If you would like to organise a Sewage Treatment System for your home or business fill in our online quote form.


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For more in depth sewage systems information visit our Sewage systems Information page

Why Use Express Wastewater Solutions?


    Because we are not a manufacturer and not tied to one particular system we can always offer the best solution for your wastewater needs.


    Because we do this every day we have developed a close knit expert team for every step of the process – from plans and council paperwork to excavations, electrical and plumbing. We handle it all to make the whole process as stress free and quick as possible.


    Most people have never installed a home sewerage treatment plant and don’t know the next step, that is why we offer a free 30 minute phone consult with one of our experts to point you in the right direction.


    We handle your wastewater installation from start to finish we can deal with all the trades, council everything so you don’t have to worry about a thing.


    Have peace of mind knowing that Express are licensed, insured professionals that will do your job right the first time.


    Not sure what system is right for you, or want to know if your system is working properly? Just give one of our friendly wastewater experts a call and they will be more than happy to help.


    We will always look to repair your system rather than replace it if it does not need to be, which will generally save large amounts of money sometimes up to and over $10,000.