Greywater diversion should be for beneficial use only; it is not an option for easy disposal of wastewater. Owners and residents must recognise that a greywater diversion device must be treated like a garden tap (i.e. turned on only when the garden needs water). If the greywater diversion device is turned on all the time, there is a high risk of detrimental impact to the environment (plants, soil, and water-bodies) and to residents’ health.
Any greywater that cannot be immediately reused for sub-surface irrigation at the residential premises must be diverted to the sewer. Diverted untreated greywater is not suitable for use in the house for toilet flushing or washing.
For a greywater diversion device, the sources of greywater include:
A temporary greywater diversion system is a temporary
arrangement that diverts greywater for immediate use. Examples of this
are washing machine wastewater pumped directly from the washing machine
(rinse cycles preferred), collection of shower water in buckets prior
(while warming up) or during showering, and siphoning water from laundry
The most important aspect of a temporary greywater system it that the greywater should be captured before it enters the household drainage system.
There are a number of temporary greywater diversion system options that can be used when sourcing and applying this greywater:
A permanent greywater diversion system diverts greywater after it passes
the plug hole to a holding tank with little treatment (usually some
sort of simple filter system) . The water must be used within 24 hours
or automatically pump to sewer. This is known as a Permanent Greywater
Diversion System. This system can only be installed by a licensed
A permanent greywater diversion system incorporates the following features:
It is the responsibility of the individual and plumber who undertakes these activities to obtain appropriate approvals where necessary and to ensure that their system is maintained and operated in a safe and sustainable way.