The Science of UV

By Rin-rin Yu

T o many operators, UV systems seem like magic. But they really rely on careful science. Here’s a detailed explanation of how the systems work.

“Dirty” pool water flows from the filtration system to the UV chamber.

Within the chamber, a quartz tube is filled with an inert gas and a tiny amount of mercury. Electrical energy excites the gases, creating a low-pressure glow that emits UV light.

As more electrical energy is activated, the lamp heats up and causes the pressure to increase to a “medium” level of 190 to 350 nanometers, ideal for pool sanitizing.

The newly filtered pool water enters the chamber, and is exposed to this dose of UV light, killing off germs, bacteria, viruses and chloramines.

The now 99.98 percent-purified water then receives a chlorine injection before returning to the pool, ready for swimming.




FEATURE STORY
Seeing the Light
A growing number of indoor facility operators are hailing UV sanitizing technology as the ultimate cure for chloramines. Here’s what it can — and can’t — do.