Great for well water and/or as an add on to any whole house water filters or any other 12 GPM , 24 GPM, 36 GPM vertical flow filtration application. Ultraviolet Water Sterilizer System manufactured with axial flow reactors in 304 stainless steel and comes with 2” MNPT connections. The hard glass germicidal lamps provide an economical way of treating water requiring a 99.99% reduction of bacteria and virus and protozoa. This process is accomplished without adding any harmful chemicals to your drinking water. Ultraviolet Water Sterilizer System is the most ecological way of treating your water… and all for just pennies a day!