Grits are inert, dense, and highly abrasive material. They include pebble, sand, silt, broken glass, bone chips, and egg shells. Grit accumulates in pipes, corners, and bends, reducing flow capacity, and ultimately clogging pipes and channels. It also accumulates in the treatment units resulting in the loss of treatment capacity. Grit is a nonputrescible material and is much heavier than water, which results in creating heavy deposits in pipes and channels. Some of the topics discussed in this chapter are the need and location of grit removal, the settling behavior and types of gravity settling, and types of grit removal facilities.