NUVO 1500 Above Ground Pool Ultraviolet Sanitizing System Ultraviolet water sterilizer disinfects what chlorine can't Chlorine resistant pathogens such as E.coli, giardia, and cryptosporidium are destroyed by the UV lamp In-line chamber plumbs to your existing above ground pool system, added just before the pool return Includes 2in. unions with adaptors for flex hose, standard 110/115 plug