In the filtration of fluid materials, the removal of particulate from the moving stream requires substantial pressure to maintain flow and substantial capacity for removing particulate. In various embodiments, the screw may include a countersunk head having a recess for accommodating a driving tool, a tapered neck, a plurality of crown ribs extending over the head and neck, a lubricating coating, main threads with a large thread lead, and lower threads having an asymmetrical profile and extending onto a gimlet point. The cold start operation is carried out only if, and so long as, both communication controllers are in the \u201cready\u201d state. An interface may further be provided to allow the amendment or confirmation of the candidate subset of data. The value is therefore associated with a sourcedestination pair within the private network.