The present invention provides a system and method for controlling leading edge contamination and crossflow instabilities for laminar flow on aircraft airfoils that is lightweight, low power, economical and reliable. A nozzle concentrator structure including an acceleration nozzle with a flow extraction structure may be coupled to a containment vessel. The medical fluid pump including a sensor for determining the volume of fluid pumped by the pump. 5, one or more monomers comprising CTFE and after an amount of polymerization reaction time has passed, adding a neutralizing agent to the reaction medium to increase the pH of the reaction medium to within a range of about 1. When the user event is complete, the data collector program sends the collected user event data to the server. The assembly comprises a plurality of first elements, and a plurality of second elements, each first element including attachment means for attachment of an end face of a duct section thereto, and, in use, at least one second element engages with two first elements.