UV 405 AL2, 20 l/min, 524mmWRAS approved AL range of ultraviolet water systems come with a simple power supply and green red LED. All chambers are 304 stainless steel. The AL2 range has a days run indicator and audiable alarm for lamp failure or end of life Inside the stainless steel chamber runs a sleeve made of a special quartz glass. This glass is transparent to UV rays and inside this is a UV lamp. The quartz sleeve is sealed into the chamber at each end, creating a water