This specialized book is distinguished by its approach of not only covering the theory but also sharing the author's experiences from over 30 years of work in the field of filtration and purification of cooling lubricants. The significance of cooling lubricants, as well as their purification and application in the machining industry, is explained in a practical manner. In addition to the fundamentals of filtration, a variety of cleaning methods are presented, including design considerations, advantages and disadvantages, and specific features of each application case. The outlined structure of modern cooling lubricant circulation systems and examples of proven systems provide decision-making support for solving practical problems. In this new edition of the specialized book, additional cleaning components and their practical applications have been included.