Loop reactor system (IMAGE) Helmholtz Centre for Environmental Research - UFZ Caption The five reactors with microbial communities were operated in the same way. The sixth reactor was connected to all five reactors. It synchronised the microbial communities and fed slow-growing bacteria back into the reactors. Credit Zishu Liu / UFZ Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.