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A good way to avoid decalcification is to use a so-called "depuratore", a water filter, at the water hose. You attach the water filter on the long hose in the tank, i.e. the hose that sucks up water in the boiler. Water filter minimizes the risk of calcium deposits in boilers and pipes. Limescale leads sooner or later to your machine unusable why this must be handled carefully.
You should change the water filter approximately 4-8 times per year, slightly depending on how lime-rich the water is where you live.