Functions of the seven desalination stages Stage 1 (PP): Removal of large impurities, dust, and dirt suspended in the water. Stage 2 (UDF): Activated carbon filtration to remove chlorine, colors, and undesirable taste. Stage 3 (CTO): Solid carbon to ensure precise removal of residual chlorine and organic matter. Stage 4 (Membrane): Fine reverse osmosis membrane to remove excess salts, heavy metals, and bacteria. Stage 5 (Post Carbon): Improving the taste and smell of water after it leaves the storage tank. Stage 6 (Volcanic Rocks): Compensating water with essential minerals the body needs, such as potassium and magnesium. Stage 7 (Nano Silver): Balancing the alkalinity of the water and protecting it from bacterial growth to ensure complete purity.