Warranties, compliance and our frequently asked questions.



Waterflow NZ Ltd warrants that the NaturalFlow system will be free from defects in material and workmanship for the following periods of time from the date of installation as set out in the following conditions:

  1. Roto-Moulded tanks and components 15 years
  2. Filter media 15 years
  3. Dosing float and/or pumps 2 years
  4. Waterflow NZ Ltd will at its discretion replace or repair such components that prove to be faulty with the same or equivalent part at no charge.
  5. Warranty of operation only covers the performance of the NaturalFlow systems as connected to the effluent inflow for which they are designed, and also installed to the criteria as set out in the relative installation instructions and procedures.

Warranty excludes defects due to:

  1. Failure to use the system in accordance with owners manual.
  2. A force majeure event outside the reasonable control of Waterflow NZ Ltd as such but (not limited to) earthquake, fire, flood soil subsidence ground water table variations or plumbing fault.
  3. Modifications to surrounding landscape after installation.
  4. The actions of a third party.
  5. the system required to bear loads (either hydraulic or biological) greater than that for which it was designed.
  6. Any modifications or repairs undertaken without the consent of Waterflow NZ Ltd.


The NaturalFlow System complies with all the following standards, as set out in the NaturalFlow Compliance Requirements document.

The NZ Building Code

Section of AS/NZS 1546.1:2008 and Section of AS/NZS 1547:2000 state that tanks constructed to these Standards will meet the requirements of the code for Clauses B1 and B2, structure and durability
Clauses G13.3.4 relating to on-site treatment and disposal systems and G14.3.1 and 14.3.2 relating to the control of foul water as an industrial waste, are also covered in engineers Producer Statement – PS2 – Design Review

AS/NZS Standards

Compliance with the relevant sections of Section 9 of AS/NZS 1546.1:2008
Compliance with the relevant sections of Parts 2 and 4 of AS/NZS 1547:2000


How Does Your System Work?


Does it require Power?

Can the Grey Water be reused?

Does it require a Soakage Field?

Is it accepted by Councils?

What are the Maintenance Requirements?

How do I Protect the Worm Colony?

Does Antibiotics or sickness have any effect on the worm colony?

Does temperature affect the Worm Colony?

What if the Worms die?

Can I install it myself?

Can I use my own Drain Layer?

What is the Difference between an Advanced Primary and a Secondary System?

What is the minimum Distance allowed for a system from a building?

What shouldn't you flush down your toilet?

How close can I discharge to a waterway/building/boundary etc?

Download our Brochure

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