Liquid Filtration is the process of removing solid particles from a liquid with a filter medium collecting the particles and allowing only the clean liquid to flow. The filters are characterized by the type, particle size, flow rate, pressure range, and inlet/outlet size. The particle sizes are 0.1μm, 0.21μm, 0.3μm, 0.5μm (absolute or nominal), 0.7μm, 0.8μm, 1μm, 1.8μm, 3μm, 4μm, 5μm (absolute or nominal), or 20μm.