A magnetic welding and joining device is provided. The process and apparatus generally introduces a population of fine diameter air bubbles and one or more flocculating chemicals into an effluent stream to produce buoyant floc structures that include the heavy metals and that can be removed from the effluent stream. The tissue samples can be stored on flexible tissue sample strips arranged around the circumference of a rotating vacuum manifold disposed within the chamber. The flow path further includes lubricating oil contact with the absorption filtering element.