[kachingchingpow]

No doubt that you can fill volumes with what I *don't* know about tempering metal. The trailer *does* put out some extremely hot water though, so it wasn't difficult to make this assessment. Not to mention I actually watched it happen with my own eyes as it was under the water. I'm going to try to snap a picture or two and get them on here. Hopefully my camera will capture the damage. I've owned this trailer for quite a few years... and it's never done this to any other blade that I've put under it. I *swear* the blade has that same blueish hue that a piece of steel get's when it's exposed to an extreme heat.

As for water... it's well water. I've never tested the water myself, but sulfur is an occasional problem if the power goes out and we deplete the holding tank. When that happens I'll pickup some sulfur into my heater. Usually evident pretty quickly with the familiar "rotten egg" smell. Quick flush of the heater and it's no longer an issue.

Yeah I'm familiar with blueing. Again, I've cold blued few old "tools" (blades would be a complement), just for the sake of cleaning them up a little. Hot blue would be the route I'd go.