"We wanted to open it up for the weekend," he said. "It's a chance for the townies who have never been here to come out."
Mr Manning said the hot pools opened commercially in February 1914. However, local Maori had bathed in them since 1849.
With Lake Rotoiti being the cleanest it had been in years, the pools were now more popular than ever, he said.
"It's a magnet," he said. "I don't know of any others in New Zealand that don't have a road go to them, it's a unique situation."
Mr Manning said he expected the weekend to be one of the busiest in the pools' history but, with five pools and four jetties, there was plenty of space.
"Everyone is invited. If they can get to the taxi, they can come out, they will be made to feel welcome," he said. "They will be stunned by the experience."
Normal admission prices apply. For full details see www.lakerotoitihotpools.com.