Philips PLS UV Bulb
Philips PLS UV Bulb Lamps are available in 5w, 7w, 9w, 11w and 13w sizes and are compatible with most brands of UVC. The Standard replacement UV lamps have 2 small pin connections at one end of the bulb.
To keep your pond clear from algae and green water build up bulbs should be replaced every 8 to 12 months, the recommended time to replace a bulb is at the start of spring just as the pond season starts, this ensures the UVC is at optimum performance for when it is needed.