Kaeser screw compressor line filters are made of high-quality stainless steel and feature a unique design that allows them to be used as both an air filter and a pre-filter. The Kaeser screw compressor line filter is designed to remove oil mist, dirt particles, dust, and other contaminants from compressed air before it enters the compressor. This ensures that your compressor will run more efficiently and last longer.A line filter is an improved type of water filter that is used to purify water by removing minerals and particles. It can be used with or without a pump or a pressure tank, and they are often paired with other water purification systems.