In these tanks, the product is treated for the purpose of changing its properties. They are widely used in dairies, e.g. ripening tanks for butter cream and for cultured products such as yoghurt, crystallization tanks for whipping cream, and tanks for preparing starter cultures. There are many different types of process tanks. The application determines the design. Common features are some form of agitator and temperature control. They have stainless steel shells, with or without insulation. Monitoring and control equipment may also be fitted.