Commercial Sewage and Wastewater Systems

NaturalFlow is your solution for power-free and eco-friendly commercial sewage and wastewater treatment systems.

Eco-sustainable Systems

When it comes to commercial water treatment, NaturalFlow is superior to a large number of sewage and wastewater systems. Unlike septic tanks and other sewage systems, the NaturalFlow system relies on natural processes to treat commercial sewage and wastewater, avoiding costly energy usage and requiring minimal maintenance. The result is a cost-effective, completely sustainable wastewater treatment system operating quietly in your backyard.

Our commercial water treatment systems are tailored to accommodate our client’s unique needs. We have systems that can handle businesses with ten employees and systems that can handle facilities used by up to 40 people. As part of the NaturalFlow difference, we can build and install your NaturalFlow commercial wastewater treatment system based on your site’s requirements. As a team, we are dedicated to providing quality support on time, every time. No matter where your business is in New Zealand, we will provide you with quality installation and exceptional support services. Get in touch with us today to discuss your needs.

What Sets Naturalflow Apart

Costly power usage, system failure, constant monitoring: these are all too common with most onsite sewage systems. NaturalFlow addresses these problems by doing it simpler: ‘Natures’ way. With its commercial sewage treatment, NaturalFlow provides commercial facilities with a cost-effective system that allows them to manage their wastewater efficiently.

NaturalFlow Onsite Sewage System Installation

Hassle-Free Installation

NaturalFlow is committed to delivering sustainable wastewater systems to commercial establishments nationwide. We have installers and designers covering the region, helping businesses throughout the country improve their facilities.

Our team takes care of everything from installation to council sign off. We ensure that every box is ticked and that we leave our clients with a long-lasting, high-performance wastewater treatment system. With over 40 years of experience in the construction industry, we have the skills and the resources to ensure that installations go as smooth as possible.

Our registered drainlayers and NaturalFlow certified installers exhibit a high level of professionalism in all aspects of work. Understanding how our activities can affect business operations, we make sure to keep disruption to a minimum and complete installation strictly on time and on budget.

To ensure structure integrity and compliance, all work undertaken are in accordance with the latest regulations such as the AS/NZS 1547:2012 and the NZ Building Code.

How It Works


Like the forest floor, NaturalFlow breaks down wastewater until it is safe to be reintroduced into the environment. The NaturalFlow system separates the black water (toilets and kitchen) from the grey water (showers and laundries) at their source, to prevent the solids from emulsifying with the bulk of the wastewater. The commercial water treatment system uses a combination of water treatment methods such as vermiculture and natural media filtering processes with zero use of electricity.

Black Water Treatment


The treatment of the black water commences in the Wormorator, an enclosed ecosystem simulating the forest floor. Inside the chamber, the black water is directed onto a bark medium, which effectively filters out liquid and preserves maximum solids.

The residual solids are processed by tiger worms, breaking them down and converting them into water-soluble nutrients. Tigerworms are proven to be the most effective worms for this process and are able to consume as much as their body mass daily.

Finally, the liquid wastewater and nutrients flow through a series of natural filtration media’s to further purify them until they are ready to be brought back to the environment via a Land Application System.

Grey Water Treatment


NaturalFlow processes grey water with a practical simplified process. Separated from black water, low-toxicity grey water can be treated for reintroduction into the environment.

The treatment of grey water is achieved through various levels of natural settling and filtering processes, until scum and solids are treated and broken down to the point where they are safe to be reintroduced into the ecosystem. Grey water can be reused for surface or sub-surface irrigation, such as watering trees, orchards, hedges, plants, etc. A key advantage of this system is that it prevents problems like odour that commonly occur with septic tanks.

Reusing grey water can deliver significant savings for the commercial sector. Whether used for watering gardens or flushing toilets, the use of grey water can significantly reduce businesses’ dependence on the main.

Benefits Of Naturalflow

Aligning with its mission, the NaturalFlow wastewater treatment system harnesses resources that allow for energy, time and cost savings.


Energy Savings

NaturalFlow is a non-electric water treatment system. The system uses nature’s purification processes to treat wastewater. Harnessing the power of nature’s active bio-system, NaturalFlow requires 90% less power than a standard system on a flat site and absolutely no power on a sloping site. With NaturalFlow, you can also recycle grey water for more savings.


Cost Savings

NaturalFlow harnesses sustainable natural processes that work for you – for free! It is a cost-effective system from day one and into the future. Robust and rugged, NaturalFlow’s components have high resistance to shock and intermittent loading. This means your system is set to last for years, giving you absolute peace of mind.

Healthier, Cleaner Environment

NaturalFlow offers numerous environmental benefits. Operating with little or no power, far less finite resources are used to treat wastewater. The impact of wastewater on the environment is likewise minimised since grey water is treated immediately to prevent putrefaction. Plants on effluent fields absorb the rich nutrients produced by the Tiger Worms, preventing contaminants from reaching the underground water table. 


Time Savings

NaturalFlow requires 75% less maintenance than most other systems. It uses natural processes that operate continuously without constant monitoring. Using only light machinery, NaturalFlow is easier and faster to install and is perfect for steep and difficult-to-access sites. Compatible with kitchen sinks and toilet systems, you only have to get one system for sewage and wastewater treatment. 

With the quality and care that we offer, you can have the assurance of a robust, hassle-free sewage treatment for your commercial site.

Talk To Us Today

Waterflow NZ Ltd has professional Installers and Designers that cover every region of New Zealand, so where ever you are situated from the Cape to the Bluff, just call our friendly team now to find out the closest one to you.


What Others Think

“Gee I love you guys :)”

I was called this morning from Rangi to say the 6-monthly inspection is being done at 2pm today.

Your guy doing it has been held up, so he actually called to let me know.
This is never happens normally with tradie type people.

If your company ever needs someone to sell your systems up this end of the woods then give me an interview.
After my experience with all your people, I would be proud to sell it!

Kim Robson


What Others Think


“NaturalFlow system is such a basic and easy system to look after and operate. We are very pleased with it and are glad we went with the system. The grey water has certainly been great on the gardens and the black water bed once planted looks after itself. Great!”

Dennis & Marie


What Others Think

“Looks after itself”

“Back in 2008 along with our building projects we decided to go for the NaturalFlow sewage system as it didn’t require any power, on our site. We have been very impressed with the performance of this system, with very little maintenance, it basically looks after itself.
Without hesitation I would recommend the NaturalFlow system to anyone as I have had no difficulties with product or the friendly team at Waterflow NZ Ltd. 



What Others Think

“Low site impact”

Just a quick email to say a huge thank to you , ken & the team.
Stoked with the work done , the boys on the diggers did a awesome job .
Every thing was left nice & tidy , super happy !!
Xmas bonus for all !!

John Cullen