The effect of UV light on bacteria, viruses, spores and moulds has been known to science for many years. The shortwave ultraviolet energy is lethal to micro-organisms as the UV rays penetrate the cell membranes and destroy the DNA inside the cell, effectively destroying the organism and its ability to reproduce.
Ultraviolet disinfection is extremely fast, it requires no chemicals or additives and cannot be overdosed. No chemical residuals are left in the treated water.
The UV intensity (dose) is measured in mJ/cm2. For domestic situations UV systems should give at least 30 mJ/cm2 and for larger industrial systems 40 mJ/cm2.
The dose required to inactivate bacteria depends on the bacteria. the higher the dose of UV the more of each bacteria are killed.

The Atlas ’H’ range is designed for reliable disinfection of drinking water and can treat flows from 38 l/min (2.3 m³/hr) up to 151 l/min (9.1 m³/hr). These WRAS Approved compact units benefit from axial flow polished 316L stainless steel UV chambers coupled to a unique and innovative controller featuring a user friendly colour LCD display that provides meaningful user feedback messages.


