It also noted that components purchased and the water main installed would be repurposed.
Council drinking water team leader Judith Robertson said an option to inject water into the city’s network was suggested to council staff by a business on February 15.
However, the vision to treat water pumped from a bore on Nelson Road and inject it into the city’s bulk supply water main on the same road soon ran into difficulties.
“The chemistry of the ground water source was unsuitable for the proposed treatment method,” Robertson said.
“Very advanced and expensive treatment systems which would take months to instal and commission were suggested by a design company as an alternative.
“With many uncertainties and the long time delay, this scale of the project did not present as a viable option under emergency conditions.”
The supplemented water was expected to help with water restrictions, especially for some industries which required water for production, Robertson said.
Gisborne remains in a water crisis with residents being urged to reduce use.
The back-up Waipaoa plant has become the main source of water for the city in lieu of repairs being made to the Waingake pipeline which sustained serious damage during February’s storm.
The most recent update from the council last week said some treated water supply from Waingake would be achieved “within weeks”.