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The glass industry uses water in various production steps. Water is mainly used for washing produced glass after cutting, grinding, or after storage in intermediate steps, when the produced glass from one operation waits for a longer period before the next operation, and it can become contaminated. Water quality is key to effective glass washing. In particular, the number of dissolved ions affects the surface properties of glasses and therefore many ions in water are undesirable. Water is also used in steam generators, where the water evaporates and the steam heats, for example, heating cylinders. In this application, it is important that the water does not contain large amounts of dissolved ions that could cause scale formation. The aim of the work is to analyse the water quality from different production steps in an effort to be able to recommend which water is suitable for which production step.