Replacement bulb for the Little Giant 9-Watt UV-Light Clarifier.

Replacement bulb for the Little Giant 9-Watt UV-Light Clarifier.  Most UV sterilizer bulbs have an effective life of 6 to 14 months (or about 6,000 to 9,000 hours of continuous use). After this period, the intensity drops by roughly 30% to 50%

In aquariums and ponds, the UV light is primarily used to eliminate free-floating algae and harmful pathogens. An old, weakened bulb won’t clump the algae together for your filtration system to catch, leading to cloudy, green water. In drinking water systems, it can leave your water vulnerable to harmful bacteria. [1, 2, 3, 4]