Leading competitors have at best a Log 3 reduction. For example, in laboratory tests, starting with 100,000 pathogens, a Log 3 kill leaves 1,000 harmful micro-organisms active after a 99.9% reduction. In contrast, PURITY UVC’s Log 5 reduction reduces the harmful colony to 10 bacteria after a 99.999% reduction. So, the competitors’ UV light manages to get a Log 3 kill rate at best and leaves 100 times more harmful micro-organisms to breed and infect than does the PURITY UVC which gets a Log 5 kill. The competitors UVC systems leave 100 times more harmful viable micro-organisms in the water than the Purity UVC system.