33 Nachungs along with the Principal, health co-ordinator, NFE instructor and supporting staffs of Sertena Primary School under Haa Dzongkhag went to clean our school water tank. The cleaning was done as a part of social services for the community. The Nachungs were advocated on keeping our water tank clean so that most of the water borne diseases can be prevented. Also, they were advised to drink boiled water everytime and prepare SODIS(solar disinfection system) at schools.