Coolant filtration Liquid filtration is the process of removing solid particles, contaminants, or bacteria from liquids to ensure the quality and reliability of the medium. In industrial applications, liquid filtration is used to keep process fluids, coolants, or wastewater clean and to protect equipment from wear and clogging. Using filters such as cartridge filters, bag filters, or membrane filters efficiently separates particles, resulting in a more stable process and a longer service life for pipes, pumps, and valves.