Frequently Asked Questions

The How's and Why's?

Greywater encompasses all household wastewater that is not to do with the toilet (i.e. kitchen, shower, sink, and laundry). This so called ‘waste’ water is a valuable resource which can be utilised for garden and lawn irrigation to help maintain a well-watered and healthy garden (no summer water restrictions need apply!). It can also be treated for household reuse such as cleaning or laundry.

Re - using greywater provides a number of benefits including reducing potable water demand (reducing water bills) and also reducing the amount of wastewater discharged into the environment.

Greywater systems purify waste water through an organic process by which bacteria contained in the filter material (in the tank) breaks down the nutrients/contaminants in the water. Simple maintenance usually consists of annual replacement of the filter material.

Grease Traps

It is good practice for a Greywater System to also incorporate a Grease Trap. Grease Traps are designed to remove oils and grease from kitchen waste before they can reach the Greywater System. This simply ensures that the Greywater System isn't overloaded with nutrients. Some Grease Traps also use a textile filter to prevent any solids (food scraps) from entering the system. This means the greywater is much easier to treat to a sufficient standard to be dispersed above or below ground.


Greywater systems can be easily installed by yourself and comes with DIY installation instructions. To obtain council approval a plumber needs to sign off on the trenching to state that it has been installed in accordance with the site plan drawn up by your Geotech engineer.

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