"Help to save the environment. Learn the science of cleaning and reusing dirty water by conducting interesting water Purification experiments. Build your own water filtration and desalination plant at your table top; disinfect water with solar power and more. it's a cool water science experimental kit.The Green Science Clean Water Science Kit contains: 4 filter sections, 4 filter plugs, round filter base, active carbon, sand, gravel, filter papers, funnel-shaped collector, small plastic cup, soft wax, fishing line, transparent tube, 2 transparent caps, silver reflector card, black plastic cup, 2 metal washers and a full experiment guide with fun facts. Age 8+"