Drinking water cab be made absolutely safe by adding some:
(a) aspirin tablets
(b) iodine tablets
(c) chlorine tablets
(d) chlorophyll tablets
Question 9 Which of the following procedures will give you water free from all impurities? (a) Adding chlorine tablets (b) Distillation (c) Boiling (d) Filtration
why trekkers and mountaineers usually carry chlorine tablets with them?