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Mineral residue inside of the internal pipes and heater can cause intermittent steaming or in severe cases no steaming at all. The best way to avoid this is to use de-mineralized or distilled water in the unit. The procedure below can be used to clear mineral buildup. If you are unable to use de-mineralized or distilled water we recommend you use this procedure monthly to help avoid mineral buildup. 1. Turn the unit off and unplug the power cord. 2. Unscrew and remove the hose from the hose conn