The process of compressing air typically produces a substantial amount of condensate that contains air compressor lubricant carryover. Without an oil-water separator in your compressed air system, this condensate/lubricant mixture will go down the drain and quite possibly find its way into the surrounding groundwater.
Water Separators are mechanical separators that are typically installed downstream of the air compressor tanks. They look like an in-line air filter, and uses centrifugal force to separate water by directing the air in a spiral. Depending on the compressed air’s temperature, these Water Separators are able to remove 40-60% of water from the compressed air.