To quote the guy who posted the picture "I bought the turbo used and it already had the discoloration on the blades, other than that it was perfect. The turbo has never been run without an oem filter."
he had a filter.
he had this to say before the picture "This was with a .6mm jet placed about 12" before the compressor. "
Mist may not be as bad but I can tell you anything other than air hitting the compressor spinning at 80,000 rpm isn't going to be good for it. In steam powerplants they do not let the steam get to a point where it begins to condense because it erodes the turbine blades. Any particle, be it dust or water, will do damage to a blade at these speeds.
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