Global Adsorbents offers a range of high-performance filter media (Pebbles/ Gravels/ Sand/ Chips/ Filter Sand/ High silica Sand/ River bed Sand) for general water and effluent treatment needs. Quartz and River sand are used as media with excellent removal efficiency for suspended contaminants. Water is passed through a fixed bed of filter media whereby the contaminants are trapped inside interconnecting void space and thereby removed. The bed can be backwashed in cycles on a pre-determined pressure drop or backwashing can simply be done after fixed time intervals.