Gravity greywater bundle
GreyFlow™ | Gravity Greywater Diversion Package
A gravity-fed greywater diversion bundle for sites with suitable fall, using additional grease separation and screening before greywater is directed to a site-specific land-application pathway.
This package is designed for projects where a non-pumped GreyFlow™ Gravity system is preferred, but where upstream protection matters because gravity does not provide the same push as a pumped greywater system.
Flow pathwayGravity-fed
No pump required
ProtectionMid-size grease trap
Improved screening
Dripper fieldOptional only
Requires verified fall
Best forSuitable slope
Low-energy sites
Grouped bundle selection
Build the package from the products below
This is a grouped greywater bundle page rather than one sealed kit. Select the required products and options from the list below so the package matches your site, installation method and intended use.
This package is built around gravity-fed diversion and enhanced upstream screening. Pricing is calculated from the products and options selected below.
Package pathway
Gravity diversion with stronger upstream protection
Greywater source
Suitable greywater streams may include shower, bathroom basin and laundry. Kitchen-inclusive wastewater is heavier and requires more protection because of fats, oils, grease and food solids.
Grease protection
A mid-size Passway™ grease trap / grease interceptor is recommended to improve screening and protect the gravity-fed discharge pathway.
Diversion unit
GreyFlow™ Gravity provides a non-pumped filter/diverter pathway where the site has reliable fall.
Land application
No dripper package is included as standard. Dripper discharge should only be selected where suitable downhill fall and field design are confirmed.
Why this package is different
Gravity systems need the site to do more work
- Prioritises grease separation and screening before greywater enters a gravity-fed pathway.
- Recognises that a non-pumped system has less hydraulic energy to move residual grease, fine solids and scum away from the system.
- Supports simple off-grid or low-energy sites where there is reliable fall and the discharge pathway can be designed properly.
- Allows dripper components to be added only where the site has sufficient downhill fall and a suitable field design.
Gravity discharge note: This package does not include a dripper field as standard. A dripper pathway should only be selected where the site has sufficient verified downhill fall, generally around 4 metres or more, and where the field design is suitable for gravity-fed discharge.
Recommended core products
Products to select below
GreyFlow™ Gravity
Non-pumped greywater filter and diverter for suitable sites where gravity can do the work.
Passway™ mid-size grease trap
Recommended upstream grease separation for kitchen-inclusive or grease-risk greywater pathways.
Optional dripper field
Only add where sufficient downhill fall, field length, soil conditions and discharge layout are confirmed.
Optional advice
Contact WCTNZ® before ordering if you are unsure whether the site has enough fall for gravity discharge.
Site and consent context
Final design remains site-specific
Site suitability note: Final greywater design depends on source water, site levels, fall, soil conditions, land-application area, local authority requirements and installation method. This bundle provides a practical product pathway, but site-specific approval, plumbing connections and installation are not included unless separately scoped.
NZ Building Code and council review: WCTNZ® can provide product information, technical documentation and consent-support information for customers, designers, builders, plumbers and wastewater professionals reviewing a greywater pathway.
