The process of filtration involves the flow of water through a granular bed, of sand or another suitable media, at a low speed. The media retains most solid matter while permitting the water to pass. The process of filtration is usually repeated to ensure adequate removal of unwanted particles in the water. It is the oldest method of filtration but still widely used in municipal water treatment plants today.

Different media & Different techniques  are used for removal of mechanical impurities, Clayey turbidities, Colloidal, dissolved impurities, organic matter, detergents, polycyclic aromatics, coloring substances, oils and aliphatic hydrocarbons etc. which impart taste or odour, polyvalent heavy-metal compounds, germs and bacteria.

Unitech offer a wide range of filtration systems standardised on the basis of