Abstract: Bio-sorption is a promising technology for the removal of contaminants like nutrients, textile dyes, organic matter and heavy metals which have hazardous effects on the aquatic ecosystems. In recent years many low cost sorbents such as algae, fungi, bacteria and agricultural byproducts have been investigated for their bio-sorption capacity towards water contaminants. But less attention has obtained my Mollusca shell as a waste material for the utilization of bio- sorbent due to its composition and availability. The studies conducted with the focus of utilizing Mollusca shell has confirmed that the propensity of shells to remove contaminants in waste water as a single component and combinations with other materials.