Reverse Osmosis Is An A Capella Group Formed At The University Of Southern California In January 2001. They Have Released Three Albums 2002's Aural Pleasure 2003's Fifty Million Reverse Osmosis Fans Can't Be Wrong And 2004's Purity Guaranteed. This Fall They Will Release Their Fourth Studio Effort SisomsO. They Were Recently Honored As Finalists At The ICCA Finals In New York Where They Came Away Scored As The Number One Mixed Group In The World!