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.
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
Types of Wastewater
Overflow & Floor Drain
Types of Treatment Systems
DGTS & GWDD
DGTS & GWDD
*Greywater is often referred to in shades. 5 shades are known.
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.
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.
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.
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.