Autoclave must use distilled water as the working medium. Even pure water it also contains various minerals,evaporation at high temperatures will produce scale. Over time, the accumulation of scale will be causing the steam leak, causing a small pipe jam,pressure and temperature sensor failures etc. While in chamber with the hole sterilizing equipment, scale easy to jam into the small pipes and bearings, to make equipment performance degradation, which affects using life. This shows the importance of using distilled water.Clinics, hospitals, laboratories and other occasions often use a little of distilled water it' s the best way to get distilled water by .You just need to fill into the ordinary tap water,and then you can get high-quality distilled water! Everything so easy!