Arcadia 18W PLL UV Bulb

It is recommended to replace the UVC bulb every 9 to 12 months of continuous use, as its UVC output significantly diminishes over time, even if the bulb still lights up.

This UVC bulb is most effective against free-floating green algae that cause cloudy water. It does not directly kill string algae or algae growing on surfaces, nor does it address the root causes of algae blooms like excess nutrients.

This 18W PLL bulb is designed for compatibility with most UV clarifiers that use the PLL bulb type and require an 18W rating. Always confirm compatibility with your specific UV clarifier model's manual.

UVC light is a specific wavelength of ultraviolet light that is germicidal, meaning it can kill or inactivate microorganisms like algae and bacteria by damaging their DNA. Regular visible light does not have this effect.

Results can typically be seen within a few days to a week of continuous operation, depending on the severity of the algae problem and the correct functioning of the UV clarifier unit.

For optimal results in controlling algae, it is generally recommended to run the UV clarifier continuously. This ensures that water is constantly being treated as it passes through the unit.

Verify the bulb is functioning (it should emit a faint glow) and that it's correctly installed. Check that the UV clarifier is appropriately sized for your pond volume and that the water flow rate is suitable. Ensure the quartz sleeve is clean. The bulb may need replacement if it's old, even if it lights up.

Check the power connection to the unit and the electrical outlet. Ensure the UV unit's ballast or transformer is functioning correctly. Inspect the bulb and its connections for any damage.

Handle UV bulbs with care, as they are often made of glass. If a bulb breaks, carefully remove all fragments, ensuring no glass enters the water system. Wear gloves to avoid leaving oils on the new bulb. Consult the UV clarifier manual for specific replacement procedures.