Question

the three layer of purification present in the filtration tank made up of dash dash and dash​

Answer 1

Answer:

Filtration tank which has three layers: fine sand layer at the top, a coarse sand layer in the middle and gravel at the bottom.

Answer 2

Explanation:

During the process of water purification, water which comes to the filtration tank has impurities and suspended particles. Filtration tank which has three layers: fine sand layer at the top, a coarse sand layer in the middle and gravel at the bottom. In this process, the layers of sand and gravel act as filters.