Ran into a rusty old firebox in Evansville that made me rethink my grinding approach

I was doing a boiler inspection at a plant outside Evansville last Thursday and found a firebox with scaling so bad it looked like it had been sitting in saltwater for 10 years. We had to burn through about 6 hours of grinding just to get a clean surface for the patch and I realized my usual disc setup was chewing up more time than it saved. Anyone else swapped to a different cup wheel or wire brush for heavy scale and noticed a real difference in runtime?

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