NATURALFLOW SERIES NF1500
System Specification & Installation Instructions
See our website: www.naturalflow.co.nz
New Zealand’s Leaders in Eco-Sustainable, Odourless Wastewater and Sewage Systems
Compliance Requirements
All NaturalFlow Treatment Systems meet the requirements of the NZ Building Code G13-VM4.
Section 9 of AS/NZS 1546.1:2008 state that tanks constructed to these Standards will meet the requirements
of the Code for Clauses B1 and B2, structure and durability.
Compliance with Section 9 of AS/NZS 1546.1:2008 and also 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 covered
in the ‘NaturalFlow Compliance Requirements’ document.
Please feel free to ask for a copy of this complete document, if required.
The Treatment Process
The NaturalFlow Series NF1500 Treatment System comprises of a 1.2m diameter WORMORATOR® module
where the wastewater, in order to separate the solids from the liquid, is directed onto a bed of natural
medium, designed to retain maximum solids.
These residual solids are seeded with tiger worms which proceed, as results of long term testing have shown,
to digest them reducing the volume by approximately 95%, leaving only residual vermicasts which are virtually
free of harmful bacteria and other pollutants. The black water (B/W) then flows through a secondary filter
medium, which further treats and aerates the water, reducing the TSS & BOD, and also reducing the particle
size, in the TSS, to less than 1mm. This secondary treatment tray acts as an in-built outlet filter AS/NZS 1546
1:2008 Clause D3.3. and has a minimum life expectancy of 15 years.
It then trickle flows into the Dose Treatment Chamber where it is combined with the grey water (G/W) and
final settlement and filtration takes place.
The grey water, which is separated at its source from the black water, flows into the first chamber of the Dose
Treatment chamber, which retains the bulk of the scum and solids, where it is combined with the B/W, then
through the aerating matrix filter resulting in a treatment level that is well above the Advanced Primary
criteria. This treatment chamber has a buffering capacity of 1000ltrs to contain any surge flows.
It is then disposed of, into the receiving environment, in accordance with AS/NZS 1547:2012 and the relevant
local authority’s requirements. The size and extent of the disposal systems are determined by the receiving
environment and the expected flow volumes. Factors such as soil types, slope and the proximity of potentially
sensitive environments and constraints such as creeks, bores, wells etc determine the extent, location and
type of disposal system chosen.
The Wormorator® and associated dose tank has a 2000ltr reserve capacity where pump loading is necessary
to allow for 24 hrs emergency storage should a pump fail. The operating capacity of the NaturalFlow Series
NF1500 Treatment System is 800ltrs per day of combined Black and Grey water.
Because the WORMORATOR® is a dry vault system there is negligible sludge build up so it does not require
any regular de-sludging. This specifically meets clause AS/NZS 1547:2012 5.4.2.2.1 as to desludging
requirements.
