What part of the water pump failure made you think that it was the distilled water/water wetter which caused it?My friend ran water wetter with distilled water at the track and coolant/water wetter in an 08 GT500 for 25K miles and it failed the water pump (ate up the fins).
I would run it for a track night then change out the coolant in the days soon after.
We are thinking it's from the water wetter because that's all he used in it when racing other than 50/50 mixed coolant when it sat in the shop. When we took apart the engine (it blew a head gasket), the fins on the water pump were pitted.What part of the water pump failure made you think that it was the distilled water/water wetter which caused it?
Reason I ask is because tons of people, both that I know personally and those I hear of online, that run this stuff all the time and have never had any issues with either rusting or mechanical failure (myself included). Makes me thing that it wasn't the coolant mixture's fault for your failure.