In general, groundwater is a preferred source of drinking water because of its convenient availability and its constant and good quality. However, this source is vulnerable to contamination by several substances. This book describes the adsorptionMoreIn general, groundwater is a preferred source of drinking water because of its convenient availability and its constant and good quality. However, this source is vulnerable to contamination by several substances. This book describes the adsorption method in the removal of selected heavy metals present as cations (Cd 2+, Cu 2+ and Pb 2+ ) or oxyanions (Cr(VI) and As(V)) using iron oxide coated sand (IOCS) and granular ferric hydroxide (GFH).