Membrane water treatment is a process that removes unwanted constituents from water. A membrane is a barrier that allows certain substances to pass through while blocking others. Water treatment facilities use various types of membranes and processes to clean surface water, groundwater, and wastewater to produce water for industry and for drinking. Water filtration is am future of industries that is growing as a result of increasing concerns about contaminants in water and decline in safe, clean, easily accessible existing water sources.