May 27, 2018

What is UVT:

UVT – Ultraviolet transmittance – is one of the most important performance parameters to consider when selecting a UV system for your application.

  • UVT is a measurement of the UV energy, at precisely 254 nanometres wavelength, that passes through the water column.
  • UVT is usually expressed as a percentage, with a higher number corresponding to ‘clearer’ water, which allows more penetration of UV radiation for the deactivation of pathogens.

‘Clearer’ doesn’t necessarily mean clear to the eye.

Some UV-absorbing chemicals appear transparent but can drastically reduce the UVT of water!

When selecting UV disinfection for any application – whether potable water, rainwater harvesting, wastewater, or water reuse – it is most important to understand the UVT of your source water and any seasonal or other changes that might affect the effectiveness of UV disinfection.

This is especially important for surface water sources where spring runoff, heavy rain, falling leaves, and airborne debris such as pollen can have a major impact on water conditions.

UV Pure’s products are validated to provide an effective UV disinfection dose in water with UVT as low as 50%.

This level of treatment assures public health protection under challenging conditions and is significantly better than many conventional UV systems, which are often rated to be effective for cleaner water at UVT above 75%.

UV Pure systems can achieve this level of treatment because Crossfire Technology® incorporates a dual-lamp, reflective disinfection process that provides 2.4 times the dose of conventional light-in-a-pipe systems and targets pathogens from 360 degrees to eliminate shadowing. Each unit is also equipped with a self-cleaning system that prevents fouling of the quartz sleeve from minerals and enables it to be effective in water 10 times harder than conventional systems.

How Crossfire Technology® works: