Chemical analysis of flotation circuit tail water and the concentration levels of ions that is detrimental to the flotation process performance are given in the table below. 1000ppmCaO is added into the thickener as a scaling agent (precipitant). Thickener overflow will be recycled back to the flotation feed as process water. According to the table below, please calculate the amount of ions that should be removed from the recycled water to achieve an efficient flotation? Precipitation in thickener will not taken into consideration in calculations. * Hint: (Ca:40 g/mol, 0:16g/mol)