GB 50015-2019 第3.2.8条
| The hotel domestic water supply system should be equipped with disinfection facilities. When ultraviolet disinfection is used, the UV dose should not be less than 40 mJ/cm²; when chlorine disinfection is used, the contact time should not be less than 30 min, and the free chlorine residual should not be less than 0.3 mg/L.