Small lysimeters (10 L) have been set up in the Lincoln University greenhouse facility. These lysimeters have been filled with soil from Banks Peninsula. Unlike the field lysimeters, soil in the greenhouse lysimeters has been repacked to give a consistent density and structure throughout the soil profile. Some of these lysimeters have been amended with sewage sludge, while others are receiving wastewater from Duvauchelle at a rate of 1000 mm per year. For each treatment, there are four replicates of lysimeters planted in pasture, manuka and kanuka. This experiment is being conducted by PhD students Minakshi Mishra, Saloomeh Alikhani and Obed Lense. The results will reveal how the sewage sludge and municipal wastewater affect the growth and quality of the plants. Saloomeh will measure the effect of the wastewater on the production and quality of essential oils from the manuka and kanuka. Minakshi will measure the mechanisms by which manuka and kanuka kill pathogens in the sewage sludge and wastewater, and Obed will measure the effect of the plants on soil quality and the leaching of contaminants. We expect to obtain the results from this experiment by mid-2016.