The top three Christchurch mayoral candidates John Minto, Lianne Dalziel and Darryll Park have gone head to head on the city's hot topics.
Controversial topics included water bottling, chlorination, the Eastern suburbs and the Crusaders name change.
Political commentator Mike Yardley told Chris Lynch John Minto's authenticity made him the clear winner of the debate.
He says there's a serious risk Minto could split the left-wing vote.
"If he really eats into Lianne Dalziel's potential voter base, we could have a surprise result where Darryl Park manages to take the top slot."
LISTEN TO THE INTERVIEW ABOVE