Method for handling microparticles in such a manner, that at least two treatment steps are performed for microparticles in the same vessel without moving the particles to another vessel. The combustion chamber is a substantially cylindrical or frusto-conical chamber, coaxial with the axis of the generator turbine, and includes a single injector. Attached to the distal ends of the two strap members are clip’s that selectively attaches the strap member to the framework or underside surface of seat or to a portable stand that may be included with the system. The surface area of the inlet of the axial flow path is less than the surface area of the outlet of the axial flow path. A method of operating a filter assembly is also disclosed. From another point of view, the net attached to the opening has a mesh number between 250 mesh and 400 mesh.