Underground wastewater pump station
GreyFlow™ | WF-UPS320 | 320L Underground Pump Station – 1500W Macerator
This compact, economical, and versatile underground pump station is built to handle all typical sanitary and household wastewater for single dwellings and light-commercial applications.
The 320L pump pit with integrated grinder pump and alarm provides generous storage, robust performance, and straightforward maintenance access in one factory-assembled unit. It collects and macerates sewage and greywater, then pumps it to a higher-level sewer, onsite treatment system, pressure main, or higher-level gravity drain where gravity fall simply is not available.
Pit capacity320L
Underground chamber
Pump1500W
Grinder / macerator
Discharge50mm
Pressure line manifold
Custom inletInvert height
320L option set
Macerator range
Ready-to-install all-wastewater lifting
The GreyFlow™ macerator pump station range is designed as a ready-to-install, plug-and-play package that simplifies specifying, installing, and servicing wastewater lifting systems compared with building a one-off pump pit from scratch.
- A compact footprint with generous usable volume.
- Robust macerator pumping for sanitary wastewater.
- Clear, simple alarm indication for peace of mind.
- Straightforward access for electricians, plumbers and service technicians.
Residential and light-commercial use
Where gravity fall is not available
In many New Zealand homes and small dwellings, toilets, showers, laundries or kitchen fixtures end up below the available sewer or treatment system inlet — for example in basements, under-slab bathrooms, detached sleepouts, cabins or relocatable buildings.
The GreyFlow™ Underground Pump Station can be configured as a complete all-wastewater lifting station, collecting combined blackwater and greywater and pumping it via a small-diameter pressure line to:
- Council sewer, where consented.
- A septic tank or advanced onsite wastewater treatment plant.
- A higher-level gravity drain, where fall is not otherwise available.
The heavy-duty grinder pump macerates solids into a fine slurry, reducing blockage risk and allowing wastewater to be pumped through relatively small pressure mains over significant distances, subject to proper hydraulic design.
Multi-user facilities
Suitable for light-commercial and remote amenities
The same package is also suitable, subject to design, for light-commercial and multi-user sanitary facilities, including:
- Staff toilets, showers and laundries in offices, workshops and warehouses.
- Amenities blocks in small commercial sites, gyms and tourism operations.
- Remote or stand-alone buildings where gravity connection to the main system is not feasible.
Installed below ground, the system keeps critical components out of sight while the integrated control and alarm pathway provides clear indication of normal operation and high-level events. This makes it a practical option for sites where reliability, ease of service and minimal visual impact are all important.
Final suitability, loadings and connection type must always be confirmed by the project designer or engineer to ensure compliance with local council and plumbing requirements.
Challenging sites
General pump pit use by design
Beyond sanitary wastewater, the 320L pit and grinder pump can also be used as a general pump station for clear or lightly contaminated water where appropriate.
- As a lifting station for separate drainage or stormwater catchments where gravity fall is not available and where such configurations are permitted by local regulations.
- As a shared pump chamber feeding a downstream grease trap and treatment system for approved kitchen and food-service applications.
- As part of packaged solutions for remote ablution blocks, cabins or modular buildings.
Configurations should keep stormwater and sanitary wastewater systems separate where required by code and good practice.
Custom configuration
Designed to fit real site layouts
Access cover options
Non-trafficable service access, pedestrian access, or Class C trafficable cover options to match expected surface loading.
Inlet configuration
Custom inlet position and invert height options support site-specific pipework setout, including 700mm, 750mm, 800mm, 850mm and 900mm invert height selections.
Breather position
50mm breather vent position can be selected to suit the installation layout, including front, left, right or back positions.
Monitoring option
Optional high-level audio/visual alarm kit provides early warning of rising liquid level or pump failure.
Configuration options should be confirmed before manufacture or dispatch so the unit matches the project drainage layout, surface loading and service-access requirements.
Basic specifications
Core product details
Product type
Underground all-wastewater macerator pump station.
Pump pit
320L heavy-duty polyethylene chamber.
Pump
Powerful approximately 1500W grinder / macerator pump.
Inlet
100mm DWV inlet for standard building drainage connections.
Discharge
50mm discharge manifold with non-return / check valve for connection to rising main or pressure sewer line.
Control
Integrated float control for automatic start / stop based on liquid level.
Alarm
Optional high-level audio/visual alarm kit with visual indication and mute button.
Cover
Pedestrian-rated lid as standard option, with alternative loading cover options available.
System advantages
Factory-assembled pump station package
Unit
- Factory-assembled, plug-and-play pump station — pit, pump, manifold and optional alarm supplied as an integrated package.
- Heavy-duty polyethylene chamber built for underground installation and long service life.
- Compact footprint for tight sites, with top access via a lockable cover for inspection and servicing.
- Suitable for single-dwelling and light-commercial applications where fall to sewer or treatment plant is not available.
Pump and hydraulics
- High-performance grinder / macerator pump to handle toilet waste and typical sanitary solids when used as directed.
- Single-phase 230V operation for straightforward electrical connection by a qualified electrician.
- Integrated float switch for automatic, level-controlled operation.
- Discharge manifold with check valve to protect against backflow into the pit.
Installation and maintenance
- Supplied with stainless steel lifting chains and shackles for safe pump removal and servicing.
- Single integrated chamber greatly simplifies installation compared to building a custom pit from separate components.
- Internal layout designed to support quick visual inspection and straightforward maintenance by trained technicians.
Local technical support, spare parts and system design advice available from WCTNZ®.
Warranty and compliance context
Installed as wastewater infrastructure
- Supplied with manufacturer-backed warranty on pump and controls, subject to current product documentation and full terms and conditions.
- Designed to be installed in accordance with New Zealand plumbing, drainage and building requirements, and with any conditions of local council consent or network utility approval.
- Final compliance depends on correct selection, design and installation by suitably qualified professionals.
Important notes
Kitchen, commercial and design use
This pump station is suitable for handling typical sanitary and household wastewater, including toilet, bathroom and laundry flows. For commercial kitchens, high-grease food preparation areas or heavy kitchen use, an appropriate grease trap or grease management system upstream of the pump station is strongly recommended and may be required by local regulations.
Always consult your wastewater designer, engineer or local council to ensure the system configuration meets regional rules and site-specific consent conditions.
WCTNZ® support
New Zealand supply and support
WCTNZ® is the exclusive authorised distributor of GreyFlow™ greywater systems and pump stations in New Zealand. All GreyFlow™ products available through WCTNZ® are guaranteed authentic, include official manufacturer warranties, and come with comprehensive local customer support.
