Bentonite provides a cheap, safe, effective, and economic method for wastewater treatment before disposal to the water stream. Clay minerals are effectively used for the removal of organic matter, toxic metals, and nutrients. Modified bentonite showed higher absorption compared to raw bentonite. Due to its ion exchange, flocculation, and sedimentation properties, bentonite is used in environmental protection for water clarification, and as an aid to polyelectrolytes and inorganic flocculants.