What is the correct order of treating hard groundwater, from initial step to final step in a typical treatment plant?
(A) Disinfection
(B) Softening
(C) Aeration
(D) Filtration
Choose the correct answer from the options given below :
1
(C), (B), (D), (A)
2
(C), (B), (A), (D)
3
(D), (B), (C), (A)
4
(D), (B), (A), (C)