Filtration unit

A filtration unit comprising a hollow tubular filter element, said filter element comprising:

• a tubular filter medium wall,
• a first end which is one end in an axial direction of the filter element,
• a second end which is an end opposite to the first end in an axial direction of the filter element,
• a first fluid inlet and outlet port provided at the first end,
• a second fluid inlet and outlet port provided at the second end,
• a captured-substance removal tool provided rotatably around the axial direction in the filter element, which slidably contacts an inner surface of the filter medium wall during rotation,
• a first blade disposed in the vicinity of the first fluid inlet and outlet port, which rotates the removal tool by receiving a fluid passing through the first fluid inlet and outlet port, and
• a second blade disposed in the vicinity of the second fluid inlet and outlet port, which rotates the removal tool by receiving a fluid passing through the second fluid inlet and outlet port,
• wherein the captured-substance removal tool consists of a first captured-substance removal tool and a second captured-substance removal tool, said first captured-substance removal tool and said second captured-substance removal tool being connected in series in such a manner that the first captured-substance removal tool and the second captured-substance removal tool independently operable,
• the filtration unit further comprises bearings between an end opposite to the first blade in the axial direction of the first captured-substance removal tool and an end opposite to the second blade in the axial direction of the second captured-substance removal tool,
• the bearings axially support the first captured-substance removal tool and the second captured-substance removal tool to be rotatable independently,
• said first blade integrally rotates said first captured-substance removal tool, and
• said second blade integrally rotates said second captured-substance removal tool,
• a direction of rotation by receiving the fluid passing through the first fluid inlet and outlet port from the interior of the filter media wall, of the first blade, and a direction of rotation by receiving the fluid passing through the second fluid inlet and outlet port from the interior of the filter media wall, of the second blade, are in opposite directions from each other when viewed from the same direction.