An externally mounted recirculation tank system designed for use where space in the tank is at a premium or the element needs protection from the workload. Jet Stream is fully non-corrodable and ideal for heated nitric and nitric acid/hydrofluoric acid mixtures, hydrochloric, sulphuric and chromic acids and most other known corrosive solutions. It is a complete system comprising heating or cooling element, two pumps (one operational, one reserve) and controls, designed to occupy minimum floor space. Jet Stream can be used as an external system for process tanks or as an in line unit.