Which process removes sand grains from water?
Give as many methods as you can for the following :
(a) Separating light materials from grain.
(2) Removing weevils from grain.
(c) Picking out stones from grain.
(d) Cleaning grain which has a lot of soil mixed in it.
(e) Cleaning muddy water.
Which of the following process is used to remove dirt and sand from wastewater?