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.
Widely used terminology refers to three levels of wastewater treatment: primary, secondary, and tertiary (or advanced). Primary (mechanical) treatment is designed to remove gross, suspended and floating solids from raw sewage.