Water borne viral hepatitis (A, E) is a common problem in Dhaka and other areas of Bangladesh and also in many other countries. There are many causes for the present situation. It is partly due to the lack of knowledge of water purification. Boiling is best among the all methods but it needs a setup of heating appliance. So, many people think that water filters, those are used in Bangladesh are safe. Actually water filters without UV or heating can't prevent viral infection because size of virus is very very small and its access can not be prvented by the common filters. Without UV or heating some good types of filters can prevent parasitic disease and some times bacterial infections like salmonella, vibrio or shigella which are responsible for enteric fever or gastroentritis respectively. Moreover, one can easily observe that there is no BSTI logo for quality of these filters in Bangladesh. So these filters are not helping rather misleading the people. General people using the filtered water with a good faith and are suffering. Boiling is very good but if not availble then use of chlorine tablet or liquid is more helpfull then filter.
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