The process of removing harmful scale buildup from a boiler. Descaling is usually accomplished by adding a commercial descaling product or citric acidCitric acid is, in moderate amounts, a component of good, bright coffees. It is a positive flavor acid in coffee that often leads to the perception of citrus... to water and running this solution through a machine.
EspressoA small coffee beverage, about 20 ml, prepared on an espresso machine where pressurized hot water extracted through compressed coffee.: In its most stripped-down, basic form, this is... machines and brewers should be descaled regularly (with the frequency depending on the hardnessHas various meanings: Hard can be a positive description of the green coffee, an older trade term meaning that it is dense. Hard can be a negative taste... of water used) to maintain optimal functionality.
It is also the process by which you remove scales from a fish with a knife. 😉