12-14: Biocide Treatments for Controlling Amoeba Amplified Legionella inThere is an expanding body of evidence that highly prevalent free living amoebae increase both the numbers and virulence of water based, human pathogenic, amoeba resisting microorganisms such as Legionella. We have focused on controlling amoeba amplified forms of Legionella by various biocide regimes commonly used in water treatment and provide proof for a hypothesis that explains the inability of conventional treatments in controlling these hardy and