The coolant reproducing method and reproducing apparatus of coolant

The present invention provides a method of reproducing a coolant, wherein the coolant can be made at the time of cutting the ingot with a wire saw used for re-use, so that the coolant in a laminar flow state or a hollow in the flowing in the embodiment each hollow portion of the hollow fiber membranes, from one end of each hollow fiber membrane is supplied into the hollow portion of each of the coolant, the hollow fiber membrane pore size is 0.05μm or less.