Filterra®

Green infrastructure uses natural processes to treat stormwater and provides environmental benefits. Developed after decades of research, Filterra® is a next-generation biofiltration solution, designed to provide enhanced treatment outcomes while requiring as little as 10% of the footprint of traditional rain gardens.
 


Filterra® is a pre-engineered and manufactured plug-and-play micro biofiltration system that removes TSS, metals and nutrients using natural, biological processes. Designed to treat up to 4450mm/hr and with a maximum treatable flow rate of 7000mm/hr the Filterra® media has been optimised to operate under high flow rates while maintaining high pollutant removal performance. The Filterra® engineered media is designed for low maintenance and does not need replacing under normal conditions, making it one of the most cost-effective treatment devices to maintain.

Approvals:

  • Auckland
  • Christchurch
  • Accepted by all regional councils
Filterra®
How it works Benefits Application Design Gallery Documentation

How Filterra® works

Filterra®
1

Stormwater enters the Filterra® through an inlet, energy dissipator rocks minimise scouring and flows spread evenly across the device footprint.

2

The mulch and media capture and immobilise pollutants in the runoff. The pollutants are decomposed, volatilised and incorporated into the biomass of the Filterra®.

3

Stormwater runoff flows through the media and into an underdrain, where treated water can be directed to a stormwater network.

Benefits of Filterra®

Smaller Footprint
Stormwater360 work with the consultants and other project members to develop a preliminary design and functional green infrastructure design.

Increased Biodiversity
Manufactured in New Zealand from locally sourced materials, the Filterra® complements Low Impact Design (LID) principles. New Zealand native plant species promote biodiversity, community and cultural outcomes.

Easy Maintenance
Only the mulch layer needs to be replaced every 6-12 months, sourced from an approved third-party supplier. Under normal conditions the media and plants should not need replacing. Planting, commissioning and 12 months of maintenance are included in the supply of the Filterra®.

Cost Savings
A plug-and-play device with fewer, smaller units Filterra® can offer a substantial capital cost saving when compared to bespoke rain garden designs. Additionally, with no confined space requirements and off-road solutions, there are further cost savings for stakeholders.
Independently Verified Life Cycle Cost data available on request.

Proven Performance
Filterra® engineered media undergoes at least 25 quality assurance assessments to ensure pollutant removal, hydraulic conductivity and performance over time. Each batch takes over a month to produce and is guaranteed to not leach or transform contaminants such as phosphorus or copper. Plant trials have established successful plants for the long-term health of the system, and rigorous third-party tests in New Zealand, Canada, USA and Australia are available to demonstrate its TSS, metals and nutrient removal capabilities.

Filterra®

Based on a catchment area of 2000m² in Auckland, a 2% rain garden is at least 50m². The Filterra® required to treat all flows is 8.4m²: 4m x 2.1m

Filterra®
Filterra®

Application

Ideally suited to land development projects, where economical treatment of large catchment areas is the main priority, Filterra® can provide treatment in a range of applications:

  • Subdivision roading
  • Local roads
  • JOAL/accessway treatment
  • Car parks for schools, commercial and retail
  • Industrial sites with elevated metals (specialist design may be required)

Design

Filterra® shifts the boundaries of what was previously possible with green infrastructure. Stormwater360 can provide a customised solution for your project considering the design infiltration rate and safety factor for your land-use.

Our service includes all approvals, calculation sheets and drawings, and a range of tools are available to assist with your Filterra® design, contact us today for further information.

Planting, Operation and Maintenance

High flow bioretention plants are sourced and supplied with a 12-month warranty ensuring healthy and robust vegetation. Stormwater360 operate and maintain the Filterra® for the first 12 months.

Filterra®

Units are available in a range of standard sizes and configurations:

Manhole Filterra®

Manhole Filterra®

The proven Filterra® technology is combined with the simplicity and ease of installing a manhole to create a versatile treatment solution that can easily be integrated into wider landscaping. Available in DN1050 and DN1200 options, Manhole Filterra® can be used where the supply of a precast vault is impractical or not required.

Vault Filterra®

Vault Filterra®

Standard Filterra® supply is in precast vaults from 1.2m x 1.2m, up to 4m x 2.1m. The treatable catchment area is up to 2,500m2 in most locations, or 5,000m2 in Christchurch. Vaults are supplied to the site pre-filled with media, the contractor simply needs to place the unit and connect to the network.

Roof Filterra®

Roof Filterra®

Custom solution for treating dissolved metals from roofs and other impermeable surfaces.
Talk to us for more information.

Planting Palette

Plant health is essential for the long-term performance and sustainability of biofiltration systems, and high infiltration rate soils can restrict plants’ ability to grow.
With over 50 plants comprehensively tested by Stormwater360, we are confident that the New Zealand native species proposed by us will be successful in Filterra® installations. Our plant guide features a range of grasses and trees that align with local authority bioretention plant lists.

Planting Palette
Filterra® at Coatesville-Riverhead Highway and Dairy Flat Highway Roundabout, Auckland
Case Study

Filterra® at Coatesville-Riverhead Highway and Dairy Flat Highway Roundabout, Auckland

Coatesville - Riverhead Highway Roundabout - Auckland site requirements:

-Dangerous stretch of a busy road with high traffic flow....

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Filterra® at Atkinson Avenue Housing
Case Study

Filterra® at Atkinson Avenue Housing

The car park for a new multi-unit social housing development required treatment to Auckland Council standards. The Filterra®...

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Filterra® at Hereford St Apartments
Case Study

Filterra® at Hereford St Apartments

The first Filterra® installation in the South Island, the 2017 Fletcher development required a biofiltration device with a...

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Ellicott City Parking Lot, Maryland, USA
Case Study

Ellicott City Parking Lot, Maryland, USA

Civil engineers and stormwater equipment manufacturers often plan for the 100-year storm. Yet few of their designs are...

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Westgate Development
Case Study

Westgate Development

The Westgate upgrade is comprised of 40,000sq m of development and includes the new NorthWest shopping mall and...

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Main Road, Kumeu
Case Study

Main Road, Kumeu

A new town centre is set to be developed along SH16, Kumeu in Auckland. It is comprised of...

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