The city's wastewater treatment plant is back on the table with the district council called to an extraordinary meeting on Monday.
The meeting will consider a motion proposed by councillor Rob Vinsen and this time the focus of attention is the dryer, which has been included in the redesigned plant.
The thermal dryer was a later addition to the original Cardno plan, adding an estimated $9.3 million to the costs of the rebuild, bringing that total to $41 million.
Mr Vinsen's motion asks council to immediately suspend the design process for the dryer until an independent review proves that the investment in the dryer is "financially prudent" without the participation of the Affco Group in the wastewater plant.
The Affco Group includes the Imlay works and Land Meats. The Imlay plant has been the biggest industrial discharger into the city's treatment plant but whether it will be involved in the new plant hasn't been resolved.