BOHS P904 - Management and control in leisure, display, therapy and other non-industrial systems is there to provide background and an overview of the risk of Legionella infection and how it can be controlled in leisure, display, therapy and other non-industrial water systems. It is a requirement of this course that candidates have successfully completed P901- Legionella- Management and Control of Building Hot and Cold Water Services [Syllabus GM.1]. Where both P901 and P904 courses are run on subsequent days or as a combined course then this pre-requirement is waived.