When utilizing municipal tap water, evaporation continuously concentrates minerals inside the heating block. Maintenance intervals depend on the water hardness rating (°dH / ppm) in your area and your weekly operating hours. As soon as a white film is visible or steam output declines, an acid flush is required.
Subjected to continuous thermal cycles, calcium carbonate crystallizes into compact calcite rock. This obstructs internal steam galleries, fouls solenoid valves, and leads to water droplets spitting from the nozzle due to insufficient thermal energy.