Domestic Greywater is defined as all waste water generated from household sources other than from a flushing toilet. Toilet waste water is known as ‘blackwater’. In circumstances in which a homeowner/builder adopts the use of a waterless composting toilet to manage human waste, effectively eliminating the blackwater component of the waste stream, the remaining greywater needs to be managed in some form.
The Grey 2 Green (G2G) system has been developed to enable homeowners and contractors to install a simple, passive greywater management system which effectively utilises available site and soil conditions to treat and discharge greywater on the property. The design uses widely recognised techniques for effective wastewater absorption into the soil with an emphasis on design considerations which allow for shallow rooted plants to uptake water and nutrients from the greywater via capillary action of the soil.
The design parameters outlined in this document are based on, and referenced from, the ‘Australian Standards for On-site Domestic Wastewater Management’ (AS/NZS 1547:2012).