Utilizing ultraviolet light water filters for cleansing of water for drinking is a concept that has existed for more than a century. There is a certain degree of complexity in the principles of science that form the bases of disinfection brought about by ultraviolet light. This is despite the initiation of the technology for ultraviolet light water filters having taken place a long time ago. Comprehension of the fundamentals of the manner in which it functions requires knowledge, in depth, of biology, physics and chemistry.

The fact that dangerous microorganisms are cleansed from the water by what may be described as a light that comes on in a pipe may be difficult to comprehend for those with little background in science, as a considerable number of consumers are. Representatives who are not knowledgeable may provide information that is incorrect and may lead to giving the wrong information to consumers.

Even as drinking water can be cleansed in a way that is relatively low-cost and is very effective through the use of ultraviolet light water filters, unfortunately, the frustration described above may lead to inaction on the part of the consumers. And this is unfortunate as the scientific principles on which ultraviolet light water filters are founded upon are not hard to understand for the consumers, even as these are not on the surface simple either.

On the electromagnetic spectrum, those light wavelengths that lie between x-rays and visible light are known as ultraviolet light. Ultraviolet A, ultraviolet B and ultraviolet C are the three sub-categories into which ultraviolet light may be classified into. Since humans get a sun-burn or a sun-tan on account of the first two kinds of wavelengths of ultraviolet light, these are better known than the third type. The type of ultraviolet light that is capable of causing maximum damage, however, is the third type. In ultraviolet light water filters, it is this third kind of ultraviolet light that is used.

Ultraviolet C is a kind of light that can be quite damaging as well as powerful, as has been mentioned before. An organism's DNA can be damaged and its penetration by light can take place, especially when the wavelength of the ultraviolet C light is 254nanometer and exposure of a living cell to it occurs. Inside all cells that are living, all activities are directed by the deoxyribonucleic acid or the DNA.

In order to function properly, the DNA of all cells has to be unharmed. A staircase of the spiral type is what the DNA's structure appears like. It may also be said to resemble a shape that would emerge if a ladder were to be twisted at both ends. Since two molecules comprise all DNA, another term used to refer to it is 'double helix'. The connection points can be said to be analogous to the ladder's rungs and its sides to the molecules.

The DNA can be attacked and the cell can be penetrated through by the ultraviolet C light. Some of the DNA ladder's rungs are fused together, actually, by the light. Each rung is split and the ladder is traveled along, when DNA is being replicated. DNA replication can not take place as the protein that is meant to split it during the process can not function properly, due to the fusion of several rungs on account of the exposure to ultraviolet C light. Due to this,the cell cannot reproduce. In this way, virus or bacteria cells are rendered incapable of causing infection and, therefore, disease.

Ultraviolet light water filters of different sizes are produced by manufacturers of such filters, since rate of flow of water can be different under different conditions and require a different filter. You need a longer ultraviolet light for a higher rate of flow. An adequate dose of ultraviolet light can be applied, in this manner.