Bioreactors show a lot of promise for denitifying and "polishing" groundwater before it is expressed into waterways or direct to the Great Barrier Reef via wonky holes (undersea springs).

Whilst they won't negate the need to better manage our nitrogen loads to surface and ground waters, the ability to intercept and remove nitrogen could play an important role in reducing our overall impacts. In future they may even be a useful money earner for landholders wanting to explore the proposed Reef Credits scheme.