A great, visual way to teach about water pollution! This kit offers a complete water pollution unit that covers clean water and the prevention and treatment of pollution. A combination of 11-35mm slides, six reproducible transparency masters, instructor’s manual and laboratory equipment leads students carefully through water quality experiments involving dissolved oxygen, the bacteria related to dissolve oxygen, water clarity, and the treatment of organic wastes. (15-1/2″ x 11-1/2″ x 4″; 1lb).