Greeknhi's ZR series oil free rotary screw air compressor features water rather than oil lubrication, and requires water, water filter and air filter as the basic necessities for daily maintenance. By using this compressor, oil and gas contamination is avoided and maintenance costs for the compressor are reduced. Because it is so environmentally friendly and cost effective, it is among the best choices for projects that require GMP certified, high quality air sources, such as pharmaceutical and food industries.