However, its a weak argument to suggest that we should make up this deficiency through water consumption (WQA, 2011). Tap water presents a variety of inorganic minerals which human body has difficulty absorbing (Misner, 2004). The evidence is strong that calcium and magnesium are essential elements for human body (WQA, 2011). In addition, minerals found in water can be harmful to human health. The World Health Organization (WHO) made clarification that majority of healthy minerals are needed for human body is from food or dietary supplementary sources and not from drinking tap water. The subject of minerals and RO created controversy and disagreement among water and health professionals. RO removes minerals because they have larger molecules than water. Reverse Osmosis (RO) removed more than 90-99.99% of all the contaminants including minerals from the drinking water supply (see Figure 1). Meanwhile, consumers are concerned about the removal of minerals from their drinking water. Most mineral constituents of water are physically larger than water molecules and they are trapped by the semi-permeable membrane and removed from drinking water when filtered through a RO (, 2004). Reverse Osmosis will generally remove salt, manganese, iron, flouride, lead, and calcium (Binnie et. Reverse Osmosis and Removal of Minerals from Drinking Water

Osmos salt