About the 36w Single-Ended UVC Bulb - BOGOF Manufacturer: UVC Bulbs ADD ONE 36W BULB TO YOUR BASKET AND RECEIVE TWO!!! This powerful 36w UVC bulb zaps away your green water and is suitable for many UVC units and filters, including the following: FiltersFish Mate 45000Hozelock Bioforce Revolution 14000Laguna Pressure Flo 20000PondXpert SpinClean 30000PondXpert SpinClean Auto 30000Oase Filtoclear 20000Velda Clear Control 75 UVCsBlagdon Pro 36wBlagdon Pro 72wHozelock Vorton 36Oase Bitron 36Oase Bitron 72PondXpert Greenstop 23000PondXpert GreenStop Pro 36wPondXpert GreenStop Pro 72w