FAQs

Stormwater is rainfall (water from a storm event) that makes contact with a surface ie ground and/or roof.

Stormwater can:

• Soak into the ground (Infiltration)
• Be held on a surface and evaporate (Evaporation)
• Flow across surfaces (Runoff) and discharge to pipes, streams and ultimately the sea 

Stormwater management is the act of managing stormwater runoff from developed sites to protect human and ecological values and prevent adverse impacts on the environment. 

1. There are two main Stormwater management categories;

• Quantity management involves limiting the disruption of the natural hydrology by;
• Reducing the impervious land cover
• Controlling the peak outflow discharge ie storing stormwater onsite and releasing it at a reduced flow rate (detention)
• Soaking it into the ground (infiltration)
• Retaining it onsite for water re-use (retention)

2. Quality management involves limiting the disruption and pollution of natural water bodies by

• Preventing contaminants from entering the stormwater network
• Reducing onsite sediment-generating activities
• Treatment and removal of contaminants

Unfortunately no. We recommend engaging an external contractor (typically a registered drain layer) for installation of our products. 

Stormwater runoff can contain a variety of contaminant speciation, with a wide range of concentrations.

Contaminants found in stormwater may include

• Sediment
• Heavy Metals
• Nutrients
• Gross Pollutants
• Polycyclic Aromatic Hydrocarbons (PAH)

Stormwater treatment devices are designed to remove sediment and other contaminants from stormwater runoff. Over time, the accumulated contaminants can clog/block the treatment mechanism and are required to be removed to maintain the design treatment efficiencies. 

If the device is left unmaintained, it will no longer remove contaminants and will not operate as designed. This may result in dirty untreated water discharging into our waterways having detrimental effects on the ecosystems and marine life. This may also be contradictory to resource consent conditions imposed for your site.

Regular maintenance is essential to the operation of the stormwater treatment device and to minimise adverse environmental effects on downstream water quality. It is important that a maintenance programme is put in place and undertaken in accordance with the manufacturers' specifications.

The asset owner and/or resource consent holder are responsible for ensuring the total onsite stormwater system, including any devices, is maintained in accordance with consent conditions. 

A Body Corporate may also be responsible for multiple (unit title) lot developments. 

Maintenance frequencies can vary between each device, site location and land use.  

As a minimum, we recommend a routine 12-month inspection to determine the need for maintenance, and a full maintenance clean if required.

Stormwater360 can provide operation & maintenance guidelines for all of our products upon request.

Please get in touch with our maintenance team via maintenance@stormwater360.co.nz for further information. 

Yes. A complete list of services can be found on our maintenance page. 

Please get in touch with our maintenance team at maintenance@stormwater360.co.nz or 0800 STORMWATER360 to arrange maintenance services. 

The maintenance service charge will depend on numerous factors including size and type of device, geographical location and removed sediment mass. Please contact a Sales Associate at sales@stormwater360.co.nz or 0800 STORMWATER for a no-obligation site-specific quotation. 

We have developed a measuring method where we ask you to take photos of the catch basin/s so we can determine the correct size of LittaTrap™. We require your assistance by following the step-by-step instructions on our Measure Up video.

Please ensure that you have location services turned on, on your smartphone device. Also, please take note of the Health & Safety recommendations on the video.

The LittaTrap™ is easy to install if you have the right equipment. We have an installation instructional guide that goes through the step-by-step process.  In some area's we have installation contractors we work with that we can provide details for. Contact us at 0800STORMWATER for more details.

The typical LittaTrap™ maintenance interval is 1 – 2 times a year. We recommend doing this at the start and end of Fall (Autumn).  Leaves and gross solids tend to compress in the device over time and are not a problem if the unit is maintained.  The system has a flow bypass that allows water and debris to travel around the system if it has not been maintained and is full. 

The frequency of maintenance services should be reviewed at the completion of each service and modified if pollutant loadings deem this necessary. If the site has a high pollutant loading more maintenance will be required.  Please see our maintenance instructional LittaTrap™ video.

The LittaTrap™ has been designed to overcome the problems of simple and earlier catch basin inserts such as leaf traps. While the LittaTrap™ looks simple it is a highly engineered device that manages the large forces and high flow rates experienced by a stormwater treatment device.  The patented basket is approximately 100 litres in volume (600mm x 600mm LittaTrap™) and has a bypass that is designed for approximately 3 times the flow that the average catch basin would receive in a 1 in 10-year storm. The LittaTrap™ is designed to not cause flooding and be easily maintained when full.

The system has been designed with Health and Safety in mind.  When the basket is full we recommend two people lift the basket.  Lifting hooks can also be obtained, which allows a single person to easily lift out when the basket is not completely full. Please see our maintenance video HERE and contact us if you require lifting hooks.

As stormwater enters a storm grate or catch pit, it passes over the oil adsorbent pads (optional) and into the EnviroPod™. Litter, debris, and other pollutants larger than the screening bag aperture are captured and retained, while oil and grease are reduced by the oil adsorbent pads.

If the screening bag is full or during high flows, overflow is released through the overflow apertures in the frame assembly.

Yes, the EnviroPod® is also effective as a pre-treatment device for use in a treatment train with hydrodynamic separators, filtration devices, ponds and wetlands.

The EnviroPod® is available in the following standard catch pit sizes; 675x450, 450x450, 450x300, and 300x300.

We can also manufacture custom sizes for non-standard catch pit sizes. 

Please contact a Sales Associate at sales@stormwater360.co.nz or 0800 STORMWATER for a site-specific design and quotation.

The standard height of the EnviroPod® cage is 1m. This can be shortened (using bolt cutters) onsite or lengthened with additional cage extensions to suit the onsite catch pits.

Our standard EnviroPod® can provide treatment flows up to 10L/s for litter, debris, and other pollutants larger than the screening bag aperture.

Peak flows greater than the treatment flow rate are bypassed through the in-built overflow apertures in the frame assembly. Refer to the summary below for the most commonly used catch pit sizes.

Yes, in many cases, it is often the most practical solution for existing sites as it can be easily retrofitted into new and existing stormwater catch pits, requiring no construction or land take.

We recommend that the EnviroPod® is monitored and maintained in accordance with relevant local authority guidelines.

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.

The supply price will vary depending on the number required and geographical location.

Please contact a Sales Associate at sales@stormwater360.co.nz or 0800 STORMWATER for a site-specific quotation.

It is hard to know the exact cost vs plain concrete driveways as it depends on the contractor used but in our experience, it works out similarly. Grasscrete™ requires less concrete as it has a high amount of void space, but it requires more labour to place, melt out former tops and fill with soil/grass seed.

The plastic formers remain set in the concrete, however, the tops are melted out using an industrial gas torch (the type used to apply bitumen roofing membrane), which creates a void that is filled with soil.

Yes, Grasscrete™ can be laid on sloped surfaces, however, you will require a lower slump concrete mix so it doesn’t run off the slope – this will require a bit more working of the concrete to finish it than a flat driveway where it would be simply pulled across the top with a squeegee.

The reinforcing mesh is 200mm x 200mm x R8mm SE82 mesh sheets from Fletcher Reinforcing.

Please contact a Sales Associate at sales@stormwater360.co.nz for a quote.

The supply price will vary depending on the region. Please contact a Sales Associate at sales@stormwater360.co.nz for a quote.

The minimum installed storage volume is approx. 2.15-2.22m³; depending on the chamber unit. This includes the chamber itself and the surrounding aggregate (150mm above and below chambers). 

Refer below table for further information;

 Additional storage can be added to the device by increasing the surrounding aggregate depth, length or width. Please contact a Sales Associate at sales@stormwater360.co.nz or 0800 STORMWATER for a site-specific design.

Yes, learn more on the  ChamberMaxx™ webpage.

We recommend a washed 40/20 drainage aggregate (i.e.no fines) with approx. 40-50% air voids. Alternative materials, such as scoria, may be used as long as structural properties are considered adequate for the proposed loading on top.

No, however, it is recommended for water retention or to prevent groundwater from entering the chambers on sites with a high water table. We recommend further technical advice is sought from Geotechnical Structural professionals for suitability based on site constraints.

A stormwater treatment device upstream of the chamber inlet such as the StormFilter™, JellyFish® or a VortCapture™ is preferred, but not compulsory. This will aid in reducing the risk of contaminants entering the ChamberMaxx™ system and prolong maintenance frequency.

The ChamberMaxx™ has been designed to withstand 243kPa at the chamber crown.

We recommend 550mm for high-use traffic loads (i.e. HN-HO-72) and 400mm for low-use traffic loads.

We recommend an ultimate bearing pressure of 300 kPa, as per the definition of 'Good Ground' in NZBC B1, for the underlying subgrade soils/ground.

If the ground does not meet this ultimate bearing pressure from field tests (ie penetrometer), the existing ground condition must be assessed by an external geotechnical or soil engineer to determine if additional bedding and/or a suitable foundation is to be constructed.

The maintenance row (also containment row) is designed to receive the first flush of storm events into the ChamberMaxx™ system, trap debris and prevent sediment/contaminates exiting the row.

We recommend an annual inspection of the ChamberMaxx™ system to determine if maintenance activities are required. Like all detention/retention tanks, the need for maintenance will depend on the site's sediment loading and buildup within the device. This can increase significantly when a pretreatment device is not installed.

Maintenance is performed using a JetVac truck utilizing a high-pressure rear face nozzle to back flush sediment and pollutants into the diversion manhole where they can be vacuumed out. 

For further information, please refer to our operation and maintenance manual.

Typical maintenance can be undertaken in half to one day. However, this will depend on numerous factors including geographical location, the size of the ChamberMaxx™ system, sediment buildup within the system and time between last maintenance activity. 

The Jellyfish® Filter is an engineered stormwater quality treatment technology featuring pre-treatment and membrane filtration in a compact stand-alone treatment system that removes a high level and wide variety of stormwater pollutants. Stormwater pollutants are removed at high treatment flow rates with minimal head loss and low maintenance costs. The lightweight Jellyfish® Filter cartridges filter the influent stormwater by providing an extraordinarily large amount of membrane surface area, resulting in superior flow capacity and pollutant removal capacity.

Stormwater enters the Jellyfish® into the height-adjustable maintenance access wall zone via the inlet pipe and is channelled through a large-diameter opening in the cartridge deck into the lower (treatment) chamber. The large opening and change in flow direction attenuate the inflow velocity. Water entering the chamber spreads slowly in a lateral and downward direction throughout the pre-treatment channel, further reducing the average flow velocity and enhancing the separation of pollutants into the high-volume sump. Floatables rise to the surface with some being trapped beneath the cartridge deck and the majority accumulating in the maintenance access wall zone. A separator skirt creates a filtration zone around the cartridge tentacles and protects them by trapping oil and floatables outside.

The pre-treated water then flows beneath the large opening in the bottom of the separator skirt and upwards into the filtration zone, further reducing the average flow velocity and enhancing pollutant separation (generally trapping < 50 microns). As water flows upwards in the filtration zone, the membrane of each filtration tentacle filters out fine suspended particles and particulate-bound pollutants like nutrients, toxic metals, hydrocarbons, and bacteria. As the filtered water passes through the membranes, it enters a perforated centre tube and flows upward and out of the top opening of each filtration tentacle. Flow exiting from each tentacle combines under the cartridge lid and exists through the hi-flow cartridge lid orifice. The combined treated water from the hi-flo cartridges is contained by a height-adjustable backwash pool weir, providing driving head.

When the storm event subsides, the driving head in the backwash pool decreases, reverses the flow direction back into the treatment chamber, and water is displaced through the draindown cartridge(s) located outside the backwash pool. As water exits through the draindown cartridge(s), it is channelled along the cartridge deck to the effluent pipe. For inflow events with a driving head that exceeds the maximum backwash pool weir height, the water is treated through the hi-flo cartridges, overtops the weir and spills onto the cartridge deck flowing towards the effluent pipe.

The system comprises a self-cleaning mechanism. From the reversed flow back into the treatment pool, the system automatically passively cleans the membrane surfaces of the hi-flow cartridges, removing accumulated sediment from the membrane surfaces and significantly extending their service life and maintenance interval. The self-cleaning mechanism occurs at the end of each runoff event and can also occur multiple times during a single storm event as the rainfall/runoff intensities and driving head vary. Cartridges can also be manually backwashed while installed or be removed and externally rinsed. The multiple options for hi-flo cartridge cleaning minimise cartridge replacement costs and life-cycle treatment costs while ensuring long-term treatment performance.

Draindown cartridge(s) are not passively backwashed. A flow control orifice in the draindown cartridge lid controls the design flow rate to one-half the design flow rate of a hi-flo cartridge of similar length and thereby reduces the likelihood of occlusion prior to scheduled maintenance.

Watch the Video HERE.

With its unique patent pending Soil Elevators™ and Moisture Portals™, the LiveRoof® system gives you the look and function of a conventional green roof, with the turn-key benefits of a modular system. LiveRoof® represents the best aspects of modular and conventional green roofs combined in one simple, attractive effective system. LiveRoof® is an integrated system designed by growers in conjunction with experts in the fields of architecture, roofing, logistics, and ergonomics.  It is designed to grow plants! Composed of recycled plastic materials, LiveRoof® is based upon sound horticultural principles.  It is earth-friendly, as well as rooftop functional and aesthetically pleasing.  LiveRoof® systems, because they are pre-vegetated at the nursery, require minimal maintenance.  Compared to site-built green roofs, which are time-consuming and costly to install and maintain, LiveRoof® offers a turn-key alternative that doesn’t require you to be a horticulturist.  LiveRoof® modules can be vegetated with various plant assortments to address your particular design needs and climate.  And if there is ever any need to make changes to the roof, LiveRoof® modules are easily moved aside and replaced after the work is done.

LiveRoof® extends the lifetime of the roof; typical estimates are that a green roof extends the lifetime of a roof between 100 and 200 percent, by protecting the rooftop from ultraviolet radiation, large temperature fluctuations, drying winds, and punctures.  Not only does the roof last longer, but there is reduced membrane maintenance.  All this brings about significant cost savings over time.

Green roofs have been proven to bring about significant energy savings, particularly during the summer cooling season in which single-story buildings can experience a reduction of greater than 25% in energy use.  Plants transform heat and soil moisture into humidity, to create natural evaporative cooling. Each gallon of water that is transpired by the plants or evaporated from the roof surface liberates 8000 BTU of thermal energy.

Filter cloth, like any filter, is designed to filter. Filters in time can plug up (think of your car’s air and oil filters, your furnace filter, coffee filter, etc.). If a green roof filter plugs up, it can cause flooding and the associated additional load on the structure as well as saturate media causing unhealthy plants.

Because of the aggregate nature of LiveRoof® soil, the soil stays in the LiveRoof® module as it would if you poured it into a funnel. It’s like the square peg in a round hole scenario. In addition to this simple act of physics, the roots of your LiveRoof® plants bind the soil together and hold it in place.

Because it was designed by horticulturists. Horticulturists know that moisture reservoirs store water. Stored water is oxygen-deprived, and roots sitting in oxygen-deprived water become diseased with fungal and bacterial rot. This weakens the plant, may spread to the crown of the plant, and may perpetually handicap the plant and predispose it to secondary disease and insect infestation.

Unlike cheap plant mix soils that have high organic content, LiteRoof® soil is predominately composed of high-quality lightweight inorganic aggregates, contains a special clay particle to bind nutrients, and is formulated with disease-suppressive organic material at a level that is consistent with ecologically sustainable soil/plant communities. LiteRoof® growing media is designed to last indefinitely and to not substantially shrink over time. Cheap mixes with high levels of peat and compost will decompose and wash away as humic acid. Perlite after several freeze-thaw cycles may shatter repeatedly and turn to dust. It may also float to the soil surface after heavy rains, and then blow away when conditions are dry and windy. Incorrectly designed mixes may also have an excessive amount of fine particles that will end up getting washed into gutters and into the stormwater system.

The LiveRoof® system weighs approximately 150 kg/m². (with a media depth of 100mm) when fully vegetated and saturated.  The&nbsp;LiteRoof® growing media follows FLL standards, enhanced to reflect current research regarding sustainable organic content.  We have intentionally avoided excessive organic content, which will shrink excessively over time due to decomposition.  Likewise, we have avoided perlite which may break down during the freeze-thaw cycle.&nbsp;

It depends on the load capacity of the existing building.  Also, some older buildings can be redesigned for the additional weight of the LiveRoof® modules.   A qualified engineer must always conduct a thorough analysis.

The need for irrigation (beyond normal rainfall) will depend upon the plants selected, the local climate, and specific weather patterns.  Under normal circumstances, supplemental irrigation is seldom required.  Even so, we suggest a backup irrigation system in the event of prolonged hot, dry, windy, sunny weather.  During very long bouts of dry weather, plants can go dormant, shrink up, and expose soil. This can increase maintenance requirements as weeds can become established in bare soil. Excessively dry soil also causes the evapotranspiration cooling effect of the green roof to be reduced.

Irrigating, even once per month during protracted dry weather, can keep your green roof looking its best and pay dividends through maintenance reductions and evaporative cooling. Irrigating during protracted hot dry weather is a personal choice, the cost is minimal and one has the piece of mind that if ever needed, the water will be there. Backup irrigation systems can range from spigot and hose to overhead irrigation (similar to what one might have in one’s yard).

Different plants are used for different climates and different functions. Plants with a higher water requirement will generally be better for evapotranspiration (cooling and stormwater management) while water-conserving plants will generally require less irrigation and maintenance. Plants that have extreme drought resistance through some means other than the root system such as succulent, water-holding plants like Sedums, Alliums, Sempervivums, Delospermas and a few others will be the hardiest green roof plants in a dryer climate.  These plants both store water and have a special type of metabolism called ‘Crassulacean Acid Metabolism’, CAM for short.  CAM plants are unique in that under drought conditions their stomates (leaf pores) are open at night rather than during the day, as is the case with most plants.  CAM plants exchange gasses (oxygen and carbon dioxide) in the dark when it is cooler and less windy.  CAM plants are up to ten times more efficient with water conservation than non-CAM plants.

LiveRoof® plants have been selected for extreme conditions, disease and insect resistance, long life, low maintenance, and beauty.   Plants are selected by local horticulturists in order to meet the above objectives as well as the local climate and customer preferences.

Numerous vegetables, herbs, and select fruits (such as strawberries and melons) may be grown on intensive green roofs that receive frequent watering, have ample sunlight, and have proper soil.

Edible plants require sufficient nutrients to support their rapid growth cycle and the energy needed to bear fruit.

When growing produce on green roofs, a blend of organic soil and traditional green roof growing media yields the best results; however, the soil will need annual amendments to maintain volume and provide sufficient nutrition.

Simply put, it is the temperature difference that exists between urban areas and their surroundings.  Urban areas tend to be from 7 to 10 degrees hotter due to the concentration of heat-absorbing buildings, pavement, and hot air from cooling systems.  The bubble of hot air that encloses cities is in large part due to a lack of vegetation and is a great contributor to smog, ozone and dust (from artificially created air currents from the rising hot air).  The urban heat island effect has also been shown to create unique weather patterns within the city, with drought, high winds and electrical storms being more common than surrounding rural areas.

Traditional rooftops are usually covered with tar, shingles or stone. As a result, they absorb sunlight.  On sunny days with an air temperature of 35°C city roofs can easily reach temperatures of 79°C or more!  The LiveRoof® system acts like a protective umbrella above the roof to shade and insulate buildings, avoiding the heat island effect associated with traditional rooftops.

Plants, of course, release oxygen and evaporate water, a process known as evapotranspiration, and act like evaporative cooling systems to make the air surrounding them considerably cooler.   By implementing a LiveRoof® system, the combined benefit of eliminating the heat generated by a non-vegetated rooftop, along with the evaporative cooling effect, is significant.

In urban areas, impermeable surfaces (streets, sidewalks, rooftops etc.) dominate the landscape, preventing rainwater from following a natural cycle of absorption.  Instead, as much as 75% of the rainwater runs into sewer systems.  Carrying contaminates from the air and roadways (salt, oil, mercury, etc.), this water flows untreated into lakes and streams.  In some cases, it may cause overflows of sanitary sewer systems, causing the dumping of untreated sewage.  In contrast, LiveRoof® green roof surfaces can absorb up to 99% of a 2cm rainfall, reduce runoff, lessen the risk of sewer overflows and flooding, and to some degree filter the water as it percolates through the LiveRoof® soil.  Even when rainfall is such that it can not all be absorbed by your LiveRoof®, the excess rain that runs through the media is filtered and delayed until after peak flows, which allows additional time for sanitary sewer systems to handle uncontrolled runoff.

Plants, soil, and trapped air and moisture in the soil are great acoustic insulators.  Studies have shown that green roofs can reduce indoor sound by as much as 40 decibels, a benefit not lost on those who work close to overhead highways and airports.

LiveRoof® works well on roofs with less than a 20-degree pitch (but can be installed up to 30 degrees roof pitch) and on industrial, commercial, institutional, governmental and residential buildings.  LiveRoof® works on any building where the building is appropriately engineered and the owners value the many economic, environmental, and health benefits that come from vegetated roofs.

Certainly—median strips, patios, plazas, and malls are also great opportunities to use the LiveRoof® system.

Yes, it’s relatively easy. First, using a flat-bladed shovel, probe the planting to locate the container edge. Then peel away some plant material. This is easy to do as the root systems of LiveRoof® plants are fibrous and easy to separate (not at all like sod). Using a sturdy pair of pliers, lift up and remove the exposed module. Any additional modules may be removed by trimming around them with the handle of a spoon and lifting them up. Once you are finished, replace the modules. Note: Never use sharp instruments around roof membranes.

As energy demands rise and smog and other pollution impacts our cities, many cities and towns are encouraging “green” building methods, including green roof systems.  Cities also encourage green roofs to reduce stormwater runoff, protect the groundwater, lakes, and streams, and conserve energy.

Be sure to check with your local authority to see what is in place in your area.  Don’t assume that nothing is available.  Cities and towns benefit greatly from green roofs, and site owners can potentially increase their building site coverage with a green roof, as well as reduce onsite detention/retention requirements.

Yes, LiveRoof® modules can be cut to size and shape, either while pre-vegetated or empty with the use of a radial arm saw (with masonry blade) or reciprocating saw. When custom cutting LiveRoof® modules, the cut side should abut the non-cut side of another module, in order to contain the soil and minimize the work of installation.

If the cut side ever abuts edging, it should not be edging that is located on the low, draining side of the roof.  Always fit modules tightly against edging or parapet or surround them with drainage fabric for added security.

Yes, you can do this a couple of times a week without causing permanent harm. If you want to avoid walking on plants, paths or walkways can be incorporated into your LiveRoof® design.

During a storm, runoff passes through the filtration media and starts filling the cartridge centre tube. The air below the hood is purged through a one-way check valve as the water rises. When water reaches the top of the float, buoyant forces pull the float free and allow filtered water to drain. After the storm, the water level in the structure starts falling. A hanging water column remains under the cartridge hood until the water level reaches the scrubbing regulators. The air then rushes through the regulators releasing water and creating air bubbles that agitate the surface of the filter media, causing accumulated sediment to drop to the vault floor. This patented surface-cleaning mechanism helps restore the filter’s permeability between storm events.

Check out the summary video HERE for more information.

The supply price will vary depending on the drainage catchment area, available hydraulic effect, cartridge size, target contaminants, media type and total number of cartridges required.

Please contact a Sales Associate at sales@stormwater360.co.nz or 0800 STORMWATER for a site-specific StormFilter™ design and quotation.

The maximum catchment area that each cartridge can treat will vary depending on the geographical location of the proposed device and local/regional council hydrological guidelines. 

Please contact a Sales Associate at sales@stormwater360.co.nz or 0800 STORMWATER for a site-specific StormFilter™ design.

Yes, the StormFilter™ cartridges use a unique float-activated mechanism and hence cannot be modelled using traditional stage-discharge curves. Although the StormFilter™ is a passive gravity-operated device, it exhibits a switching behaviour that is quite similar to the on/off switching of a stormwater pump. Hence, it is recommended to model the cartridges as a pump. 

A modelling guideline and webinar for HydroCAD can be found HERE.

The same guideline can be used for similar software.

Filterra® is available in the following configurations:

• Filterra® Bioscape - designed to treat catchments over 10,000m².
• Vault Filterra® - supplied in precast vaults from 1.2m x 1.2m up to 4m x 2.1m. 
• Manhole Filterra® - available in DN1050 and DN1200 options.
• Roof Filterra® - custom solution for treating dissolved metals from roofs and other impermeable surfaces.

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)

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®.

The Filterra® is approved by;

• Auckland Regional Council
• Christchurch Council
• Accepted throughout New Zealand

Traditionally roofs have been used to eliminate rainwater from the sewer system in washdown areas. Apart from the initial costs involved in roofing a large area, roofs can be an inefficient way to protect the sewer from rainwater , and roofs also limit the the washdown area due to the size and height restraints.

The DD series Diversion Systems are supplied complete, ready to install.