Suction Indexing Drum Filter Unit has a chain and flight drag conveyor for various applications. The Filter Unit is equipped with a belt pan conveyor for steel machining applications. The Filter Unit combines the coolant filtration benefits of the suction indexing drum filter modules with a filter tank equipped with a chain and flight drag conveyor for various applications. Suction Indexing Drum Filter Unit is provided with permanent stainless steel filter screen to facilitate ease of operation.