UltraViolet Water Filtration

UV water filtration is a method of disinfecting water by using ultraviolet (UV) light to eliminate harmful microorganisms such as bacteria, viruses, and protozoa. The UV light penetrates the cells of these pathogens and disrupts their DNA, preventing them from reproducing and causing illness. This type of filtration is chemical-free and does not alter the water’s taste, color, or odor. It's often used in both residential and commercial settings as a final step in the purification process. For maximum effectiveness, the water should be clear, as particles or sediment can block the UV light and reduce its ability to disinfect properly.

Yes, a prefilter is typically necessary for a UV water filtration system to function effectively. UV light needs to shine directly on microorganisms to effectively kill or deactivate them. If your water has sediment, iron, or is cloudy, those particles can block or scatter the UV light, making it less effective. A prefilter helps clear out those impurities before the water reaches the UV chamber, allowing the light to reach the pathogens and do its job. For this reason, most UV systems recommend or come with a prefilter - especially if you’re using well water or another untreated source.

Examples of UV systems that come with prefilters include the following:

• VH200-F10 Viqua UV Disinfection and Sediment Reduction Filtration System
• VH410-F20 Whole Home Integrated Pre Filtration UV by Viqua

UV lamps used in water filtration systems typically last about one year of continuous use. Over time, the intensity of the UV light decreases, even if the lamp is still glowing, which means it may no longer be effective at disinfecting the water. That’s why it’s important to replace the lamp annually, as recommended by most manufacturers, to ensure your system continues to operate at peak performance. Regular maintenance and timely lamp replacement are key to keeping your UV system running safely and efficiently.

What You’ll Need:

• Clean, lint-free cloth or soft sponge
• White vinegar or a manufacturer-recommended sleeve cleaner
• Gloves (to avoid leaving fingerprints or oil on the sleeve)
• Towel or tray (to protect work surfaces)
• Replacement O-rings (optional but recommended)

Step-by-Step Cleaning Process:

1. Turn Off the System: Before doing any maintenance, disconnect the power supply to the UV system. This ensures safety and prevents damage to the UV lamp or ballast.
2. Shut Off the Water Supply: Turn off the water flowing into the UV system and depressurize the chamber by opening a nearby faucet. This will help prevent water from spilling when removing components.
3. Remove the UV Lamp: Gently disconnect the UV lamp from the power source (often a connector or clip). Carefully slide the lamp out, being sure not to touch the glass with bare hands. Set it aside in a safe, clean location.
4. Remove the Quartz Sleeve: Loosen and remove the retaining nuts or caps at the ends of the UV chamber (follow your manufacturer’s instructions). Carefully slide out the quartz sleeve. Inspect the O-rings—if they appear worn or damaged, replace them during reassembly.
5. Clean the Sleeve: Wipe down the quartz sleeve using a soft, lint-free cloth or sponge dampened with white vinegar or a non-abrasive cleaner recommended by the system manufacturer. Avoid using any harsh chemicals or abrasives, as they can scratch or cloud the quartz, reducing UV effectiveness. Note: If the buildup is stubborn: Soak the sleeve in white vinegar for 10–15 minutes, then gently wipe clean. Never use anything abrasive like steel wool or scouring pads.
6. Rinse and Dry: Rinse the sleeve with clean water and gently dry it with a soft cloth. Make sure it is completely dry and free of fingerprints, smudges, or residue before reinstalling. Oils from skin can reduce light transmission and cause hot spots.
7. Reinstall the Sleeve: Carefully insert the clean sleeve back into the chamber, ensuring proper alignment. Reattach any end nuts or seals, making sure O-rings are seated properly to prevent leaks.
8. Reinstall the UV Lamp: Slide the UV lamp back into the sleeve, avoiding direct contact with the glass. Reconnect the power connector or lamp harness.
9. Restore Water and Power: Turn the water supply back on and check for leaks. Once you're sure everything is sealed correctly, restore power to the UV system. Check that the system is running as expected.