This powerful 36w UVC bulb zaps away your green water and is suitable for many UVC units and filters, including the following: Filters Fish Mate 45000 Hozelock Bioforce Revolution 14000 Laguna Pressure Flo 20000 PondXpert SpinClean 30000 PondXpert SpinClean Auto 30000 Oase Filtoclear 20000 Velda Clear Control 75 UVCs Blagdon Pro 36w Blagdon Pro 72w Hozelock Vorton 36 Oase Bitron 36 Oase Bitron 72 PondXpert Greenstop 23000 PondXpert GreenStop Pro 36w PondXpert GreenStop Pro 72w