WHAT_IS_THE_RATIO_OF_ALUM/PHOSPHATE_WHILE_ADDING_ALUM_TO_A_WASTE_WATER_IN_ORDER_TO_REMOVE_THE_PHOSPHATES_PRESENT??$

• A. 1.4 : 2.5
• B. 1 : 2
• C. 3:5
• D. 5:7