To filter a large quantity of water , a layer of _____________and pebb

1.	To filter a large quantity of water , a layer of _____________and pebbles is also used as a filter. Washed sand Dirty sand Clay None of these
Answer» ANSWER: BIO SAND FILTER is the ANS of above

To filter a large quantity of water , a layer of _____________and pebbles is also used as a filter. Washed sand Dirty sand Clay None of these

Answer»

BIO SAND FILTER is the ANS of above