Question

what is filtration define

Answer 1

the process of purifying water is called filtration

Answer 2

Loading :

We know that -

Sedimentation :

It is a process by which insoluble, solids particles which are heavy settle down on their own in a solution.

So,

Sedimentation is a slow process and the finer particles settle down. In order to speed up the process of sedimentation, we take help of loading.