South West Water is using a peristaltic pump from Watson-Marlow Bredel for dosing coagulant into raw reservoir water for purification purposes. It is thought to be the first time peristaltic technology has been used on a coagulant application, certainly within the southwest region. Originally the plant, near Falmouth in Cornwall, employed two conventional diaphragm pumps, however, suffering from blocking due to crystallisation, it was decided to investigate alternatives for the critical process of coagulant dosing. Following discussion with Watson-Marlow, South West Water took two 520DuN/R2..