I would like to know some ideas to conduct a bio seminar on purification of water

The process of water purification through sand filtration can be a good topic to present a seminar. It is an old and highly effective method of water purification and was even practiced at home in ancient time. It was like a water filter we use nowadays. For inspired by that time still now the filter we use in our water purifiers are made up of sand. A model of the same can be prepared and described in the seminar. 

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