The prescribed hardness limit of potable water ranges between 

(A) 50 to 75 P.P.M. 

(B) 75 to 115 P.P.M. 

(C) 100 to 150 P.P.M. 

(D) 150 to 200 P.P.M.

1 Answer

Answer :

(B) 75 to 115 P.P.M. 

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