Search
All Categories
    Menu Close

    WCTNZ | Grey Water Technology

    What is Greywater?

    Greywater is the wastewater produced from the hand basin, shower, bath, washing machine, laundry tub, kitchen sink and dishwasher. Greywater from the kitchen sink or dishwasher is generally too high in grease and oil to be reused successfully and should be treated differently from all other greywater.

    Note that greywater it is not the water from a flushing toilet as this is contaminated with human waste and is called blackwater.

    Greywater for irrigation (RE-USE)

    Greywater irrigation has long been practised 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. For light use
    • CGTS (Commercial 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. For high use

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

    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.

    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 wastewater a DGTS system must be used.

    If irrigation with greywater (Re-Use) is desired when kitchen wastewater is involved, a dual system can be set up onsite where about 50% of the greywater is used via a GWDD & GWDD-irrigation system and the back-flush waste from the GWDD is diverted into a DGTS or CGTS and treated before discharge (Re-Use)onsite.

    Shades of Grey*

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

    A Scale of Greywater TypesHeavy DarkDarkMediumMedium LightLight
    Types of Wastewater

    Kitchen

    Wastewater

    Laundry

    Wastewater

    Bathing 

    Wastewater

    Hand Basin

    Wastewater

    Overflow & Floor Drain

    Wastewater

    Types of Treatment SystemsDGTS & CGTSDGTS & CGTS & GWDDDGTS & CGTS & GWDDGWDDGWDD

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

    Sort by
    View as Grid List
    Display per page

    BioCeptor™ 380

    GW/BW BC 316-3-380
    New Zealand's most effective inline effluent filter! For Blackwater, Greywater & Grease Trap systems alike.
    $430.43 excl tax excluding shipping

    BioCeptor™ 470

    GW/BW BC 316-3-470
    New Zealand's most effective inline effluent filter! For Blackwater, Greywater & Grease Trap systems alike.
    $430.43 excl tax excluding shipping

    BioCeptor™ 600

    GW/BW BC 316-3-600
    New Zealand's most effective inline effluent filter! For Blackwater, Greywater & Grease Trap systems alike.
    $430.43 excl tax excluding shipping

    Everhard Industries | 250/450 Litre Polymer Pump Well

    GW PW EH 450
    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.
    $1,450.00 excl tax excluding shipping

    Everhard Industries™ | 45 Litre Domestic Grease Arrestor

    GW GT 45 #84010
    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.
    $330.43 excl tax excluding shipping

    Grey Flow™ Dripper Line 100 Meter Coil

    GW GFDL 100
    Additional Dripper Line for expansion of the Grey Flow™ Dripper Kits This expansion coil of dipper line is used when the irrigation field needs to discharge the same volume of greywater over a larger area.
    $160.87 excl tax excluding shipping

    You will be able to take part in our Review rewards program!
    Earn points for each your review!

    Filters Close
    Min: $0.00 Max: $3,044.00
    $0 $3044
    Community poll
    Help Us Help You. Take 30 seconds to share your thoughts / What's In A Composting Toilet For You?