Good quality uvc water sterilziers with different flow rate, such as 0.5gpm, 1gpm, 2gpm, 6gpm. 12gpm, 24gpm, 36gpm, 48gpm, 60gpm, 72gpm and so on, with the 304stainless steel housing. With 8000hrs life span UVc LAMP. With good qality led and sound alarm ballast.