Ultraviolet water purification lamps produce UV-C or “germicidal UV.” UV light is capable of killing microorganisms such as bacteria, viruses, molds, algae, yeast, and oocysts like cryptosporidium and giardia. Ultraviolet purification is considered the most effective technology for eliminating biological contaminates in a water supply available to homeowners. There are no known organisms immune to its effect and it’s generally regarded as being able to kill more than 99.99% of bacteria. Next to bacterial eradication the biggest advantage of UV purification is that it does not introduce any chemicals into the water, it does not alter the taste, it produces no byproducts and it does not alter the pH or any other properties of the water. In addition the system is energy efficient requiring the same amount of power as a 60W light bulb. The downside of UV filtration is that it has no effect on chlorine, heavy metals, smell or other chemical contaminates. UV lamps (bulbs) need to be replaced on a yearly basis. It is important to remember that UV light is not visible therefore the lamp may be producing light but not necessarily UV light. Therefore, after one year there is no guarantee that the lamp is producing sufficient UV to kill microorganisms. UV lamps cost between $450 and $700 depending on the type of system and replacement bulbs cost approximately $80.

Image obtained via: http://www.breathepureair.com/biozone_bulbs.html

Filed under: Sanitation & Development, Waste Water Treatment, Water Purification