Grey Water Technology

What is Greywater?

Greywater is the wastewater produced from the hand basin, shower, bath, washing machine and laundry tub. It is not the water from the  toilet, kitchen sink or dishwasher as this water  is generally too high in grease and oil to be re-used successfully.

N.B. If a greywater treatment system DGTS is being used rather than a Greywater Diversion Device GWDD, the waste water from the kitchen can be included.


Greywater for irrigation (RE-USE)

Greywater irrigation has long been practiced in areas with a limited water supply. However, proper precautions for its use have not always been in place. This has posed a problem for health officials, who believe there is no correct method for managing greywater to both balance user water needs with public safety considerations. While the engineering of these systems is still a relatively new technology, it is one that is progressing rapidly. Greywater systems can now meet both environmental and waste management requirements, while safely utilising the nutrient content in the effluent.

The options for safely using greywater as a source for irrigation are many and diverse.

There are two types of greywater systems for the domestic market that both require local government approval and state government guidelines for installation:

  • GWDD (Greywater Diversion Device) Diversion Systems are a primary filtration device that provides discharge to the land within a 24-hour period and are either gravity or pumped
  • DGTS (Domestic Greywater Treatment Systems) - Treatment systems, upgrade water quality in the process and should provide a secondary treatment level, this will provide a more flexibility means of discharge and re-use irrigation applications

N.B. All grey water diversion systems MUST use by law, a subsurface or substrata irrigation discharge system, such as drip irrigation.


Recommendation for Consideration 

The ideal means of discharge for greywater is done by pressurized dripper lines, not gravity feed trenches Read About Dripper Systems Here

For all greywater sources when including kitchen waste water a DGTS system must be use.

If a irrigation with greywater (Re-use) is desired when kitchen waste water is involved, a dual systems can be setup onsite where 50% of the greywater is used via a GWDD & GWDD-irrigation system and the back-flush waste from the GWDD is flushed into a DGTS and treated before discharge onsite.


Shades of Grey*

An indication of what types of greywater should be treated or can be diverted for irrigation.

Scale of Greywater Heavy Dark Dark Medium Medium Light Light
Types of Wastewater







Hand Basin


Overflow & Floor Drain


Types of Treatment Systems DGTS DGTS & GWDD DGTS & GWDD GWDD GWDD

*Greywater is often referred to in shades. 5 shades are known.

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Everhard Industries Grey Water Grease Trap

Everhard Industries 45 Litre Grease Arrestor is designed for connection to standard 100mm drains and is equipped with a polymer basket for easy removal of trapped waste. Accumulated scum and sludge waste matter can then be removed by authorised contractors to approved disposal facilities. The polymer trap has a strong, durable, polypropylene cover with child-resistant locking tabs and there is an optional concrete cover available. Risers are also available to allow increased cover over pipework.
$300.00 incl tax

Everhard's 250/450L Polymer Pump Well

Everhard’s 250/450 Pump Well has been a robust and effective solution in many domestic and industrial applications for several years. The new spherical design provides the symmetry that customers have been looking for with a deeper invert that provides greater flexibility in a number of usage situations.
$1,250.00 incl tax

Grey Flow™ / G-Flow Greywater Diversion Device

G-Flow is a simple, economical and reliable design of self-contained greywater diverter system. Its compact design made it easy to install and can be mounted on wall with brackets provided, above ground or partially buried.
$885.00 incl tax

Grey Flow™ Dripper Line 100 Meter Coil

Additional Dripper Line for expansion of the Grey Flow™ Dripper Kits This expansion coil of dipper line is use when the irrigation field needs to discharge the same volume of greywater over a larger area.
$185.00 incl tax

irriGREY Kit

irriGREY is the only complete dripperline irrigation package specifically designed to be used in conjunction with Grey-Water Diversion Devices GWDD.
$550.00 incl tax

Netafim irriGREY Filter Element - Four Filters

Four Replacement filters for the irrGREY Filter unit
$140.00 incl tax

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