The natural polysaccharides used for reducing the turbidity of biologically-treated effluent in the present study are mucilages obtained from Malva sylvestris (mallow) seedpods and lobs and H. esculentus (okra) seedpods. Mallow has been used as food and medicine in Europe since the ancient times in Greece and Rome. Traditional herbal medicine continues to regard the plant as a useful anti-inflammatory agent for the respiratory tract, the skin, and the gastrointestinal tract. Okra gum is a natural polysaccharide composed of D-galactose, L-rhamnose and L galacturonic acid and is used in the food industry as an emulsifying and foam stabilizing agent [15]. Recently, Mishra et al. [35,36], successfully modified okra mucilage by grafting with polyacrylonitrile and acrylamide, although the flocculation properties of the novel copolymers were not tested.