The Complete Filtration Solutions 740 Emerald Series of filters is designed to remove oil from a water flow. A single 6 inch diameter filter will hold more than 6 litres of oil before reaching a maximum differential of 35psi, a standard filter will hold 1 litre. The oil is permanently bonded to the media or bonding agent making it ideal for water disposal or usage. Reduction from 200 ppm to 5ppm is the norm.