Filtering hydraulic oil sludge does not remove it completely
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It is a simple filter that uses 1-micron bag filters; hydraulic oil is mixed with 5% bentonite, heated to 90 degrees and held at that temperature for half an hour, then filtered at 60 degrees. Very fine particles cannot be filtered out, resulting in cloudy oil that is not clear.
I saw in the book that adding a flocculant has some effect
You may consider using electrostatic adsorption or charge-balancing type oil filters; the filtration precision of such filters can reach below 0.1 microns, enabling them to remove tiny particles that are invisible to the naked eye, with a cleanliness level of NAS3 to NAS7. Long-term operation can also remove sludge and paint film from the system, ensuring the proper functioning of the equipment