Science has proved ‘Sunlight’ is good for disinfection by its Ultraviolet Rays, the natural way of purification. UV radiated in the Electro-magnetic Spectrum between the range of 100-400nm. wave-length is invisible. The UV radiation at a level of 253.7nm. wavelength possess the maximum germicidal effectiveness by penetrating the cell membranes and destroy DNA modules. This prevents cell replication.
 

Disinfection by UV technology is excellent because it achieves near cent percent water purity without any side effect. It is economical and cost effective, safe and convenient. It has no impact on pH, taste and odour; neither any chemical is required nor formation of toxic components as bye-product. These factors have made UV purification technology superior to Chlorination and Ozonation.

 Functioning of UV System

In this method water flow through the SS Chamber and gets in contact with a submerged bank of germicidal lamps housed within quartz sleeves.

Methods	Ultraviolet	Chlorination	Ozone
Destruction	Physical	Chemical	Chemical
Capital cost	Low	Medium	High
Operating cost	Low	Medium	High
Maintenance cost	Low	Medium	High
Maintenance frequency	Low	Medium	High
Disinfection  Performance	Excellent	Very Good	Unpredictable
Contact time	1-5 Seconds	25-45 minutes	5-10 minutes
Personal Hazards	Low	Medium	High
Toxic Chemicals	No	Yes	Yes
Water Chemistry change	No	Yes	Yes
Residual effect	No	Yes	Yes