Method for recycling and filtering rolling mill oil implemented for a rolling mill requiring a rolling oil flow rate between 4000 1/min and 27,000 1/min in a facility for recycling and filtering rolling mill oil having a circuit comprising, successively, along the oil flow direction: - a dirty oil tank, - a filtering system comprising several oil filtering devices capable of filtering oil in parallel, - a clean oil tank, - and wherein each filtering device has: - a tank comprising an inlet for oil to be filtered, and a cover - at least one plate element, or a plurality of plate elements, stacked in the inner volume of the tank, which are removable, capable of being removed from the tank via the top opening of the cover, each of the plate elements removably receiving filter cartridges, each of the hollow plate elements forming a collector for the oil filtered by the cartridges of said plate element, each of the plate elements comprising a filtered oil outlet removably connected to a corresponding outlet of the tank by means of a coupling, characterised in that, for each of the filtering devices, a filtering device is selected in which: - there are between one and three plate elements (11, 12, 13), - the total number of filter cartridges of the device is between 500 and 3000 cartridges, and in which method a filtration is implemented providing a nominal filtration rate between 1000 1/min and 4000 1/min per filtering device, and wherein: - when the number of plate elements (11, 12, 13) per filtering device is equal to three, the number of cartridges per plate element is between 500 and 1000, the effective volume of the tank of the filtering device is between 9 m 3 and 12 m 3 and in which method a filtration is implemented providing a nominal filtration rate between 3000 l/min and 4000 l/min per filtering device, - when the number of plate elements is equal to two, the number of cartridges per plate element is between 500 and 1000, the effective volume of the tank of the filtering device is between 6 m 3 and 9 m 3 and in which method a filtration is implemented providing a nominal filtration rate between 2000 l/min and 3000 l/min per filtering device - when the number of plate elements is equal to one, the number of cartridges per plate element is between 500 and 1000, the effective volume of the tank of the filtering device is between 3 m 3 and 6 m 3 and in which method a filtration is implemented providing a nominal filtration rate between 1000 l/min and 2000 l/min per filtering device, and in which method, for the cartridges, cartridges are chosen in which the length is between 16 inches and 24 inches, in other words between 40.64 cm and 60.96 cm, and in which method filter cartridges that can be cleaned by counterflow are used, and declogging of the cartridges is performed at regular time intervals implemented, on the plate filtering devices, one by one, using a fluid counterflow, on one of the plate filtering devices, plate by plate for each filtering device, and whereas the other plate filtering devices, disposed in parallel, filter the rolling oil. - a dirty oil tank, - a filtering system comprising several oil filtering devices capable of filtering oil in parallel, - a clean oil tank, - and wherein each filtering device has: - a tank comprising an inlet for oil to be filtered, and a cover - at least one plate element, or a plurality of plate elements, stacked in the inner volume of the tank, which are removable, capable of being removed from the tank via the top opening of the cover, each of the plate elements removably receiving filter cartridges, each of the hollow plate elements forming a collector for the oil filtered by the cartridges of said plate element, each of the plate elements comprising a filtered oil outlet removably connected to a corresponding outlet of the tank by means of a coupling, - there are between one and three plate elements (11, 12, 13), - the total number of filter cartridges of the device is between 500 and 3000 cartridges, - when the number of plate elements (11, 12, 13) per filtering device is equal to three, the number of cartridges per plate element is between 500 and 1000, the effective volume of the tank of the filtering device is between 9 m 3 and 12 m 3 and in which method a filtration is implemented providing a nominal filtration rate between 3000 l/min and 4000 l/min per filtering device, - when the number of plate elements is equal to two, the number of cartridges per plate element is between 500 and 1000, the effective volume of the tank of the filtering device is between 6 m 3 and 9 m 3 and in which method a filtration is implemented providing a nominal filtration rate between 2000 l/min and 3000 l/min per filtering device - when the number of plate elements is equal to one, the number of cartridges per plate element is between 500 and 1000, the effective volume of the tank of the filtering device is between 3 m 3 and 6 m 3 and in which method a filtration is implemented providing a nominal filtration rate between 1000 l/min and 2000 l/min per filtering device,