About the 5w Single-Ended UVC Bulb - BOGOF Manufacturer: UVC Bulbs ADD ONE 5W BULB TO YOUR BASKET AND RECEIVE TWO!!! This popular single-ended UVC pond bulb fits many filters and UVC units, including the following: All-in-One PumpsBlagdon Inpond 2000Blagdon Inpond 3000Hozelock EasyClear 3000PondXpert TripleAction 2000 Evolve FiltersBlagdon MiniPond 9000Hozelock Bioforce 3000PondXpert Filtobox 3000UVCsBlagdon Affinity