Membrane cleaning is an essential step in maintaining the permeability and selectivity of a membrane process. Cleaning can be defined as “a process where material is relieved of a substance which is not an integral part of the material”. The cleaning process must remove deposits and restore the normal capacity and separation characteristics of the system. The choice of cleaning method depends on the module configuration, membrane resistance and nature of the foulants. The type of cleaner required depends on the nature of the foulants and membrane materials.