It does not apply to the treatment of water in domestic swimming pools and for water in facilities with biological watertreatment. The purpose of this document is to ensure a consistently high quality of bath or pool water in terms of hygiene, safety and appearance, in order to prevent damage to human health, particularly as a result of pathogens. At the same time, account is also be taken of the well-beeing of the bathers (e. g. by minimizing the side effects caused by disinfectants). To this end, requirements are specified for the water quality, water treatment and the construction, operation and monitoring of bathing facilities.