How it Works


It's important to remember that it's not the plants but the microbes growing in association with the plants, on their roots, surrounding 'soil' and in the water that are actually cleaning the air.  Although these same microbes exist in the soil of typical potted plants, the fact they are encased in soil and further encased in a plastic pot means these soil microbes have little opportunity to impact on indoor air quality.

The Nedlaw system actively forces the air through the biologically active zone where the beneficials can maximize their impact on air quality.

Clean Air Return

After having the contaminants biologically removed, the cleaned air is returned to the occupied space.

Air Drawn

Air is drawn through the system either by the return air system of the building or by built in fans.


An array of air diffusors behind the rooting media ensure even air flow through the biologically active zone.


Nedlaw uses a range of green plants tailored for the job of facilitating the within the indoor space. The growth of these green plants constantly adds new organics, vitamins and nutrients to the root zone that the beneficial microbes need to survive and thrive.


Pumps in the basin circulates water and nutrients for the plants. The nutrient solution is lifted to the top of the plant wall, percolates down through the growth media and to the basin.

Mounting Options

The Living wall biofilter can either be mounted directly onto a block, poured or stud wall (as shown) or can be a free standing two sided system.


The base of the living wall biofilter functions both as a catchment for the circulating water and a reservoir.


Our TBS both supports the plants and allows air is easily pass through the root zone. This is where beneficial microbe breakdown airborne contaminants. This rooting media is supported by the array of air diffusors.

HVAC Connection

System can connect right into the building's Air Handling System

The living wall biofilter combines biofiltration and phytoremediation directly into a hydroponic plant wall. Behind the scenes, a pump constantly circulates water and nutrients from a reservoir at the base to the top of the wall. The water then trickles down the wall through a porous synthetic root media in which the plants are rooted. Air from the occupied space is actively drawn through the plant wall by either the HVAC system or onboard fans and then returned to the occupied space. As the dirty air from the space comes in contact with the growing (rooting) media, contaminants move into the water phase where they are broken down by the beneficial microbes.

The biofilter improves the indoor environment through a number of ways; first in terms of its impact on air’s contaminant levels.  A single pass through the Nedlaw Living Wall Biofilter can remove up to 90% of harmful chemicals.  Second, the living wall improves the aesthetics of the indoor space. There are increasingly strong links between greening the indoor space and the well-being of the occupants. Greening the space reduces the stress levels, increases the productivity and reduces absenteeism.

The aesthetic appeal of the biofilters makes their installation well suited for indoor space. The biofilter offers a focal point in the space which can be used as a place for casual or more formal gatherings. Integration of seating either into or near the biofilter can help create this sense of community.