About five years ago, plumber Chris Kreutzer got a call from a restaurant owner with a pressing problem: a waterline leak, as indicated by an unusually high water bill.
The co-owner of Carrboro Plumbing in Carrboro, North Carolina, came up with a novel approach to locating the leak, which he figured was in a waterline imbedded in the restaurant’s concrete-slab floor.
“I proposed cutting in a bunch of valves to isolate the problem without breaking up the concrete slab, which would force the restaurant to shut down,” he explains. “So that’s what we did. I turned the water on and off at
