GM foods are classified into one of three generations. First-generation crops have enhanced input traits, such as herbicide tolerance, better insect resistance, and better tolerance to environmental stress.
Types of systems. There are multiple systems by which water treatment systems companies can remove contaminants from water. Point of entry systems: Point of entry water treatment systems are able to treat all of the water entering a home or business and are installed after a water meter or storage tank.
Currently, several technologies that control water pollution are available: coagulation, foam flotation, filtration, ion exchange, aerobic and anaerobic treatment, solvent extraction, electrolysis, microbial reduction, and activated sludge (Bhatnagar & Sillanpaa, 2010).