Natural Flow F11000 Secondary Treatment System

Natural Flow NF11000 Secondary Treatment System (1600L Per Day)

The Natural Flow NF11000 Secondary Treatment System is New Zealand's leading power-free, vermiculture-based wastewater solution. Designed and manufactured in NZ by Waterflow, this highly efficient 3-module system treats up to 1,600 litres of combined blackwater and greywater daily to a high-performing secondary treatment level. Whether you are building a new Kiwi home, upgrading a rural property, or looking for a low-maintenance solution for a challenging off-grid site, the NF11000 offers an environmentally sustainable, odourless, and cost-effective alternative to traditional septic systems.

Why Choose the Natural Flow NF11000 System?

• Completely Power-Free Treatment: Utilises natural, passive processes that require zero electricity, drastically lowering your household running costs and ensuring continuous operation during power cuts.
• No Regular Septic Pump-Outs: The dry-vault WORMORATOR® design relies on active tiger worms to digest solids, reducing solid waste volume by approximately 95%. This eliminates the need for expensive, regular de-sludging, fully complying with AS/NZS 1547:2012 Clause 4.2.2.1.
• Silent & Odourless Operation: Harnesses natural aerobic bacteria and advanced vermiculture to completely eliminate foul smells and noisy mechanical aerators.
• Lightweight & Easy to Install: Constructed from tough, roto-moulded plastic modules, the system is lightweight and easily transportable. This makes it perfect for trade professionals working on remote New Zealand sites or challenging terrain where heavy machinery access is limited.
• Highly Adaptable Discharge Options: The treated water can be discharged via LPED (Low Pressure Effluent Distribution), PCDI (Pressure Compensated Dripline Irrigation) - surface or subsurface laid, ETS beds, soakage beds, conventional trenches, mounds, sand trenches, and arches.

Ideal Applications for New Zealand Properties

The high-capacity NF11000 system is highly versatile and commonly specified by engineers and drainlayers for:

• Medium to large New Zealand homes (typically 3 to 8 bedrooms)
• Rural baches, sleep-outs, and transportable or recreational dwellings
• Farm accommodation and worker quarters
• Rural commercial facilities and workplaces with up to 40 day staff
• Community facilities including schools, marae, camp grounds, and sports clubs
• Commercial accommodation such as motels, holiday homes, cafés, and stables

How the Natural Flow Vermiculture Process Works

The Natural Flow NF11000 system processes domestic wastewater through a highly engineered, multi-stage natural filtration sequence:

1. Blackwater & Solid Waste Treatment (The WORMORATOR®): Blackwater (including kitchen sink waste) is directed into the WORMORATOR® module (1.8m diameter x 1.7m high). Solid waste is captured on a specialised textile-lined medium. Active tiger worms digest these organic solids, reducing the volume by 95% and leaving behind highly stable, clean vermicasts.

2. Secondary Filtration: The remaining liquid passes through a secondary filter tray, reducing Total Suspended Solids (TSS) and Biochemical Oxygen Demand (BOD) to less than 1mm particle size. This built-in outlet filter acts in accordance with AS/NZS 1546.1:2008 Clause D3.3 and features an impressive minimum life expectancy of 15 years.

3. Greywater Separation & Buffering: Greywater is separated at the source and directed to the Grey Water Treatment Tank to retain grease and bulk scums, trickle-filtering through an aerating matrix and natural media. This chamber features a generous 1,000-litre buffering capacity to easily manage sudden household surge flows.

4. Combined Disinfection & Discharge: The blackwater and greywater combine in the dose chamber. Passing through a final aerating matrix filter, the water meets the strict 20/30 BOD/TSS Secondary Treatment criteria. It is then safely returned to the environment via your chosen disposal method, fully compliant with AS/NZS 1547:2012 and local NZ council regulations.

Technical Specifications & Capacities

• Daily Treatment Capacity: 1,600 Litres per day (combined Black and Grey water)
• Chamber Modules: 3-Module modular configuration
• Wormorator Module Dimensions: 1.8m Diameter x 1.7m Height
• Emergency Storage Capacity: 2,000-litre reserve capacity within the WORMORATOR® and dose tank to provide a full 24-hour backup should pump loading be required and a pump failure occurs.
• Compliance: Fully compliant with AS/NZS 1546.1:2008 (Clause D3.3) and AS/NZS 1547:2012 (Clause 4.2.2.1).

Get Expert Advice and a Custom Quote from Pratts

Selecting the right wastewater system depends on your specific site conditions, including soil types, slope, and proximity to sensitive waterways like creeks, bores, or wells. At Pratts, we are your local trade specialists in plumbing, drainage, and home sewage solutions.

Contact our experienced team today to discuss your project requirements, obtain council-compliant design advice, or get a competitive supply-and-installation quote for your New Zealand property.