The present invention relates to a system and method for providing a filter to prevent contamination of vacuum pumps during use with freeze dryers. The system and method comprising of a vacuum pump connected to a freeze dryer, the vacuum pump evacuating pressure from the freeze dryer； the vacuum pump connected to a coalescing filter at least partially collects water vapor and the particulate gas, whereby the particulates in the particulate gas are at least partially separated from the gas, the coalescing filter further separating the oil from the water and particulates, whereby the oil is rejuvenated for use with the oil composition； an oil control valve to control pressure in the system and maintain a level of oil in the vacuum pump； a drain valve to enable draining of impurities, and a final filter that injects air into oil exchanged between the sedimentary filter and vacuum pump.
