for oil removal in nut shell filters. Uses Nut shell filters were designed to separate crude oil from oilfield produced water in the 1970s, which remains the principal use. Nut shell filters can be used onshore and offshore, but are more common onshore where the treatment requirements are typically more stringent and footprint is not limited. Nut shell filters are used for tertiary treatment following primary and secondary treatment which removes the bulk of the oil and suspended solids. Typically, effluent is reinjected for reuse or disposal or discharged to a surface body of water. Categories Media filter References Filters Water filters