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If the desired micron rating is not known, then it can be determined by either the desired cleanliness class or by the most critical component in the system. With this information, you can cross over to a micron rating using a HYDAC-provided chart. This chart can be found in the Hydraulic & Lube Oil Filters catalog, entitled ”Finding the cleanliness level required by a system”, our catalog is located here at: Catalogs.