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          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.

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          Nature Flush | Enzymes - Concentrate 5 Litre (Enzymatic)

          NFE 5000
          Nature Flush Enzyme is supplied as a concentrate. The enzymes are diluted to produce 20 litres per 1 litre of concentrate. With a fresh vanilla fragrance, it is a pleasure to use!
          $194.35 excl GST excluding shipping

          Nature Flush | Enzymes - Concentrate 1 Litre (Enzymatic)

          NFE 1000
          Nature Flush Enzyme is supplied as a concentrate. The enzymes are diluted to produce 20 litres per 1 litre of concentrate. With a fresh vanilla fragrance, it is a pleasure to use!
          $44.35 excl GST excluding shipping

          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 GST 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 GST 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 GST 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 authorized 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.
          $369.57 excl GST excluding shipping

           

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