Which everyday process involves the removal of dissolved impurities from water by passing it through a bed of sand and gravel?
A
Chlorination
B
Reverse osmosis
C
Distillation
D
Filtration through sand beds
Correct Answer: Option D — Filtration through sand beds
Explanation:
Sand bed filtration passes water through layers of sand and gravel that trap suspended particles and some bacteria providing one of the main stages in drinking water treatment.