Pondmaster UV Replacement Bulbs is the replacement UV Bulb for the Pondmaster UV Clarifiers. Average "Useful Life" is 9000 hour - A good rule of thumb is to replace every year at the beginning of pond season for best results!
10, 20, 40 watt UV bulb - Quantity 1 per package. Clean or Replace Quartz Sleeve when replacing UV Lamp. Pondmaster UV Bulb has a 4 pin base.