The hardness of drinking water should be?: (A) >3, (B) <1, (C) 3-Jan, (D) >6
Answer is C. ANSWER: (C) 1-3REF: Park 20th ed p. 636Drinking water should be moderately hard. Softening of drinking water Is recommended when the hardness exceeds 3 mEq/LClassificationLevel of hardness ( mEq/L)Soft water< 1 ( < 50 mg/l)Moderately hard1-3 ( 50-150 mg/l )Hard water3-6 (150-300 mg/l)Very hard water> 6 ( > 300 mg/l)