Ultraviolet (UV) technology has been used for more than seven decades
to eliminate disease-causing microorganisms, primarily in industrial
and commercial applications. Today; however, this technology is gaining
popularity in the residential sector because it can be applied to almost
any water system, It adds no chemicals to the water, It wastes no
water and it's inexpensive to maintain.
To produce UV energy, electrical current stimulates mercury vapor
held between the electrodes of a fluorescent-like lamp. The most
commonly used UV lamp is a low pressure mercury vapor lamp with an
energy output close to 265 nm most effective at killing microbes.
Germicidal UV lamps are made with "hard glass" quartz which transmits 92
percent of UV energy far more than alternative materials.
Waterborne diseases may be caused by a wide variety of pathogenic
microorganisms. Most are made up of a cell wall, a cytoplasm membrane
and a DNA-bearing nucleic acid. Microbes are destroyed when UV light
penetrates the cell wall and cytoplasm membrane and is absorbed by the
nucleic acids. The UV energy rearranges DNA molecules and prevent the
cells from reproducing. It's then considered dead for all practical
purposes. The degree of destruction of microbes is a product of UV
intensity multiplied by contact time.
Ultraviolet is a safe, clean, easy-to- maintain method of assuring
that water is free of bacteria. It is a proven technology that has no
significant drawbacks. In some applications, its initial cost is a bit
more than chlorination, but because of its low operating cost, it
quickly pays for itself. It is essentially trouble-free. Most systems
require only an annual change of lamp�like changing a light bulb�and a
change of filter cartridges if the unit has accompanying filters.
The whole house Pura UV systems are design to convert common tap
water into disinfected and pure water. The Ultraviolet Filtration System
filters water at a flow rate of 8-10 gallons per minutes. Water is
channel through a Stainless Steel UV Reaction Chamber. This point of
entry (POE) Ultraviolet Filtration is usually installed in the main
water feed of the house and its advance technology ensures the removal
of microbiological contaminants. It's a perfect companion for a Water
Pura systems come in various sizes, from small one gallon-per-minute
undersink units for drinking water to the 15-gallon-per minute �Big Boy�
series. Most of Pura sales are in the eight-to-ten gallon-per-minute
�UV 20� whole house series.