UV Pure Technologies introduces simple, robust CACTUS™ UV water purification systems for residential and light commercial use. Reap the same, unparalleled benefits of the company’s patented Crossfire Technology. Benefits include easy, lightweight installation, quick and easy lamp changes (once per year), visual quartz inspection and a minimum UV dose of 40mJ/cm at the end of lamp life, the same as NSF/ANSI 55 Class A protocols. http://www.uvpure.com/html/OurSystems/cactussystems.php