The speed at which water passes through a UV Sterilizer determines the effectiveness of the UV. Various waterborne microorganisms such as bacteria and waterborne algae require specific UV exposure rates. Successful UV sterilization requires the targeted microorganism to be in direct contact with UV radiation that is produced by the UV lamp positioned inside the UV Sterilizer.
Effective UV Sterilization means that the UV radiation produced by the UV lamp has penetrated the microorganism's cell wall and cell membrane, destroying the cell's inner material and completing sterilization. Different types of microorganisms (bacteria, algae and parasites) require precise UV exposures to be sterilized.
But if the rules of UV sterilization have been long established, why are so many conflicting water flow rates recommended by various manufactures? UV water flow rates are the most controversial issue regarding UV Sterilizers among the garden retailers and enthusiasts? Much of the controversy surrounding UV water flow rates is a result of conflicting individual marketing strategies.
Many UV manufactures exaggerate UV water flow rates to maximize UV sales. While it is true that UV water flow rates for similar UVs will vary, they do not so because of varying UV lamp and design characteristics. It is the design of the UV Sterilizer itself that establishes its water flow rates. UV design factors include lamp performance, UV exposure chamber dimensions, and how the lamp is positioned inside the UV Sterilizer.