title: Perpetual water treatment without chemicals.
authors: T
authors: T
authors: Purkis
mesh_terms: D004203:Disinfection / Q000379:methods*; D008284:Maintenance and Engineering, Hospital / Q000379:methods*; D013242:Sterilization / Q000379:methods*; D014466:Ultraviolet Rays; D006113:United Kingdom; D014867:Water / Q000592:standards*
chemical_list: D014867:Water