The EnviroPod® Filter is a proven catch basin insert designed to be easily retrofitted into new and existing stormwater catch basins, requiring no construction or land take. It removes a significant portion of sediment, litter, debris and other pollutants from water entering the stormwater system, and can be installed in either kerb inlet, standard pre-cast or manhole catch basins.  

The product is effective as a pre-treatment device for use in a treatment train with hydrodynamic separators, filtration devices, ponds, and wetlands.

* The Enviropod Filter with a stainless steel cage is only available in New Zealand.

EnviroPod Features

The EnviroPod removes gross pollutants and suspended solids, reducing particulate bound pollutants such as heavy metals, oil, and grease. The EnviroPod Filter consists of a screening bag supported by a filterbox and structural cage/ patented basket. In New Zealand only the cage is made of stainless steel. In all other markets , the Enviropod Filter is a patented batten basket.

Using low-cost passive screening and optional oil-adsorbent media, the EnviroPod® Filter can be customised to meet site-specific requirements with interchangeable polyester mesh screens ranging from 100 to 1600 micron pore size. 200micron filter mesh filter bags are supplied as standard (unless specified otherwise).

Low cost stormwater treatment solution

Lowest capital cost of any stormwater treatment device

Pollutant capture and retention

100% capture of solid pollutants. Using a screening bag, the Enviropod captures pollutants and allows the runoff to pass through to the outlet pipe.

Effective as a pre-treatment device

Ideal pre-treatment device for filters, ponds and wetlands or over flow of swales and raingardens

Independently trialled and tested

Independently trialled and tested by city councils throughout Australia and New Zealand, and with the installation of over 50,000 units worldwide including North America, the Enviropod is the most specified and installed pit insert in Australasia.

(Independently tested by Auckland University, NZTA, Auckland Council, Tauranga City Council, University of South Australia.)

Fits a range of catch basins

Tailored to fit most catch basins— ideal for retrofits

Customised to meet site-specific pollutants

Using passive screening and optional oil-adsorbent media, the Enviropod Filter is specified with a standard 200 micron liner to capture sediment and fine pollutants down to 200 microns, but can be customised to meet site-specific requirements with interchangeable polyester mesh screens ranging from 100 to 1000+ micron
pore size.

Technical Documentation

EnviroPod Filter Specifications


Pit Width

Pit Length

Treatable Flow

Bypass Capacity

EP 675x450

600-700 mm

380-600 mm

up to 10L/s


EP 450x450

350–460 mm

400-460 mm

up to 10L/s



The standard EnviroPod filter bag is a polyester 200 micron monofilament material which is
precision woven. The filter medium has a smooth and slippery surface which allows filtered sediments to be easily washed from the filtration surface. In a high flow situation, this will serve as a self cleaning mechanism. Other micron pore sizes are available up to 1600 micron burnproof trash/litter bags for gross pollutant removal.


Open area

Thread Diameter


EP 675x450


105 micron

75g per m2

EP 450x450


105 micron

75g per m2

Head Loss

At 11 L/s

19 mm

22 mm

* Based on bag @ 2/3 full. Head loss determined by lab testing of filter fabric. (Tonkin & Taylor)

Storage Volume

Screening Area

0.155 m3

1.848 m2

0.114 m3

1.488 m2

* Figures from ARC 2003 Oakley Creek trial, (Tonkin & Taylor)

Sediment Removal

Particle Range
















* Figures from ARC Labtesting 2003 using artificial sediments, (Tonkin & Taylor)

EnviroPod Materials

EnviroPod Cage

Fabricated 304 grade stainless steel

Filter Box

Diaphragm seal; Recycled
HDPE, UV Stabilised Stainless
steel bag support ring, Fabricated 304 grade stainless steel


Diaphragm seal; Recycled
HDPE, UV Stabilised Stainless
steel bag support ring, Fabricated 304 grade stainless steel


Traffic control must be well planned when measuring a catchpit, installing or inspecting an EnviroPod Filter all standard rules and regulations governing Traffic Control & Health and Safety while working on the road must be rigidly followed at all times. All potential hazards must be identified and control methods put in place prior to undertaking any activity.

Measure Up

Before installing an EnviroPod Filter, the catchpit needs to be assessed and measured to gauge suitability. 

Download sizing Sheet PDF


The system must be monitored and maintained in accordance with relevant local authority guidelines. EnviroPod installations vary due to the vast number of catchpit configurations and site conditions. Typically EnviroPod filters will require maintenance between 3 & 12 months, depending on local site conditions, pit depth and the number of vehicle movements. The frequency of maintenance services should be reviewed at the completion of each service and modified if pollutant loadings deem this necessary. At the required maintenance interval the contaminants need to be removed from the filterbags and disposed of appropriately.  

The maintenance crew is responsible for the disposal of debris in accordance with all applicable regulations and is responsible for following all applicable regulations, and Health and Safety requirements.

Case Studies

Auckland City's Field and Laboratory Testing of Stormwater Catchpit Filters

Download Report

EnviroPod Field Testing

Download Report

ETS Management Plan
North Shore City Council Enviropod Trial

This report details the results of approximately 5 months monitoring of 294 Enviropod filters installed in selected catchpits within North Shore City

Download Report