The latest version of this market-leading pressurised filter has been greatly improved. Including foams that will last longer between cleaning more bio media for better water quality and a more powerful UVC to get rid of green water. It also incorporate a back flush system to reduce the need to take the unit apart for cleaning. Includes patented Kaldnes K3 media Back flush feature Bigger UVC Improved quality foams Inlet size is 20-25mm except the 12000 model (pictured) which is 25-40mm To read more about the Hozelock Bioforce Filter please click here. Please note that the 16 and 24000 are our sets and include a pair of 8000 or 12000 Bioforces respectively. - Hozelock Bioforce Filter (UVC) - 5500 UVC is a product of the Pond Lining|Pond Pumps|Pond Accessories|Temporarily deactived category.