Patent ID: 8506819

Claim:
A system of filtering metalworking fluid, the system comprising: a machine including a sump for receiving used water soluble metalworking fluid; a particle filter for removing particles from the used soluble metalworking fluid; first piping extending from the sump to an inlet of the particle filter for directing used fluid from the sump to the particle filter; a tramp oil filter configured to receive filtered water soluble metalworking fluid from the particle filter; a removable filter pod configured to fit within the tramp oil filter; a flexible and porous outer layer of the filter pod is configured to allow metalworking fluid to flow there-through; hydrophobic material is filled within the filter pod to absorb tramp oil from the metalworking fluid; wherein the filter pod is configured to be removed from the tramp oil filter when the filter pod is at absorption capacity; a pump for pumping filtered fluid from the particle filter to the tramp oil filter; second piping extending from an outlet of the particle filter to an inlet of the pump for directing filtered fluid from the particle filter to the pump; third piping extending from an outlet of the pump to an inlet of the tramp oil filter for directing filtered fluid from the pump to the tramp oil filter; and fourth piping extending from an outlet of the tramp oil filter to the machine for directing purified fluid from the tramp oil filter to the machine; whereby fluid is circulated in a closed loop from the machine to the particle filter via the first piping, to the pump via the second piping, to the tramp oil filter via the third piping, and back to the machine via the fourth piping.