The Parker Velcon MCP5E Series-Flow employs two different types of filter cartridges in series. Typically, the first of the MCP5E�s two housings is utilized as a prefilter. With heavy carbon or dirt contamination, this prefilter holds a cost-effective particle or colloidal removal cartridge and the second in series holds an Aquacon® super-absorbent water removing cartridge. Other cartridge combinations have proven to be effective for filtering vacuum pump oil and other oils in corrosive environments. Use either an economical dirt cartridge or an Aquacon® dirt and water cartridge in the first stage and either a Fuller�s Earth or an Activated Alumina cartridge in the second. The first stage removes dirt or dirt and water while the second removes acids, gums, surfactants, varnishes, soaps, color bodies, corrosive gasses, polar compounds, and oxidation products.