Steam is commonly used for cleaning, sterilizing, heating , as a power source and as a feedstock in chemical reactions. Un all these cases the steam supply should be fine filtered to remove the significant amount of scale and debris produced by the boiler and distribution system pipe work. When the steam is used for heating food or beverage productsby direct injection - for example in the continuous sterilization of dairy products by uperisation - then the steam is known as culinary steam and will be subject to a range of purity requirements.