Denitrificaton wall could be answer to nitrate problems

Farmers trying to lift the water quality of rivers might get help from a nitrate wall proposed to go into Silverstream Reserve near Kaiapoi to lower the steam's high nitrate levels.

The Institute of Environmental and Scientific Research (ESR) was keen to assess whether the wall, which had been successfully used with sandy aquifer systems at Waikato and the United States, could have the same results for gravel aquifer systems such as those in Silverstream and elsewhere in Canterbury. See more