Hozelock Titan come in 6 models which are 2000, 3000, 5500, 8000, 12000 and 15000. Titan pumps are designed to work in the most demanding of pond environments and have to cope with continous operation, pumping water laden with solid material. They have the ability to pump solids up to 8mm without blocking(4mm with Titan 2000 and 3000, 8mm with 5500 to 8000 and 10mm with 12000 to 15000).