It can also be made and maintained locally. Where grid power is not available, photovoltaic panels or other renewable energy sources can be used. UV has also been installed and deemed successful in the United States. In rural Erie County, New York, for example, well water that supplied a nearby school tested positive for coliform bacteria. The school's water line was outfitted with a pressurized UV disinfection system.
Water passes through a stainless steel chamber containing four low-pressure mercury vapor UV lamps.
These lamps emit germicidal UV energy, destroying bacteria and viruses and leaving the water bacteriologically safe. The children's water supply is free of chlorine by-products, employees no longer have to transport and handle dangerous chemicals, and district personnel need only clean the sheath of the unit with a vinegar solution every six months or so. Ozone A Champion Ozonation creates an electric current that is passed in an arc through pure oxygen to convert it to ozone, O 3 . This ozone gas is then bubbled through water to rupture the tough shells around cystforming parasites and deactivate the contents. Ozone also destroys organic materials and herbicide residues.