Hozelock UV Clarifier Replacement Bulb - 18 Watt PLL - Hozelock - 1542

It is recommended to replace the UV bulb annually, ideally in the spring, to ensure it operates at peak efficiency throughout the pond season.

PLL refers to the type of fluorescent lamp technology, and the 4 pins are the electrical contacts needed to power the bulb. This specific design ensures it fits correctly into compatible Hozelock UVC units.

No, this is an 18W replacement bulb and is only compatible with Hozelock Filter and UVC models specifically designed to use an 18W PLL 4-pin bulb. Always check your unit's manual or specifications.

UV bulbs lose effectiveness over time even if they still light up. A common indicator is a return of green or cloudy water that wasn't present when the bulb was new. Manufacturers recommend annual replacement regardless of visible light output.

The bulb is enclosed within the UVC unit and its quartz sleeve. While the quartz sleeve should be cleaned periodically, the bulb itself is not designed to be cleaned and should be replaced when its lifespan is over.

The UV bulb emits ultraviolet light which passes through the water, neutralizing free-floating algae (causing green water) and certain harmful bacteria, contributing to clearer and healthier pond water.

Ensure the replacement bulb is correctly seated in the socket and the power to the unit is on. Check the mains connection and the unit's fuse if applicable.

Verify that the correct 18W replacement bulb was installed and that it is compatible with your Hozelock UVC unit. Ensure the quartz sleeve inside the UVC unit is clean. Check for other factors contributing to algae, such as excess fish food or direct sunlight.

Handle replacement bulbs with extreme care. If a bulb breaks, carefully clear all glass fragments from the UVC chamber and surrounding equipment before installing a new bulb. Wear gloves and eye protection.