Students collect water samples from local streams, lakes, and rivers, then set up controlled experiments to determine the qualitative and quantitative effects of adding phosphate and nitrate compounds. Over a period of 10 days, students observe the proliferation of algae and bacteria in the test samples. Kit is ready for immediate use and includes all necessary labware, reagents, 30 student worksheets, and teacher’s manual with MSDS. Contains enough materials for 5 lab groups of 6 students each. Refill includes consumable components.