The ground wire is floating in an area that would have water in it, sometimes being electrically connected to the water, sometimes not, depending on the flow, h

The ground wire is floating in an area that would have water in it, sometimes being electrically connected to the water, sometimes not, depending on the flow, how the wire is bent, etc. He measures leaking voltage to the pipe and the water and gets readings. There are actual safe inline electric water heaters with inbuilt GFCI, proper grounding, probably other protective circuits, etc.