Treats up to 20 gpm. The Trojan UVMax Pro Series offers a unique combination of brains and brawn, with twice the raw power of other UV systems and the intelligence to provide a real-time measure of the delivered dose. The Pro Series line of products use an evolutionary lamp with twice the output of current high-output lamps, giving you compact single-lamp systems that are half the size other UV systems. The lamps last an unprecedented two years, reducing maintenance requirements. Additional features include an integrated flow restrictor, inlet/outlet connections which are 1″ FIPT x 1-1/4″ MIPT, a push-button sensor operation tester and the “CoolTouch Fan” which significantly reduces water temperature and does not waste any water. The Pro Series is both NSF Standard 55 Class A and UL certified.