If you use ordinary water instead of distilled water to feed the boiler, it will calcify. The main component of calcification commonly known as “limescale” is calcium carbonate, including magnesium carbonate, calcium sulfate and other insoluble salts.
Therefore, I think I can get a little calcium carbonate dust or scrap when cleaning the calcification of the boiler with a chisel. The higher the degree of calcification, the more I get. Although it’s basically useless, it’s very interesting.
(this is a boring suggestion I came up with after watching several videos of cleaning the boiler)