What is the primary function of a UV filter in irrigation water treatment?

• A. To remove dissolved salts
• B. To trap solids with mesh
• C. To disinfect water using ultraviolet light
• D. To improve flow with pre-filtration

Answer: (C)

UV disinfection uses ultraviolet light to inactivate microorganisms in irrigation water. The ultraviolet-C photons damage the DNA or RNA of bacteria, viruses, and protozoa, preventing them from reproducing and causing infection. This step reduces microbial load without adding chemicals or removing dissolved salts, and it isn’t a mesh filter that traps solids nor a device that improves flow through pre-filtration. Keep in mind that effectiveness depends on water clarity and proper maintenance: turbidity, color, or organic matter can shield microbes from the UV light, and the lamp’s output and the treatment dwell time must match the flow rate for a sufficient dose.