NOVELTY - Treatment system for treating a process fluid delivered to an electrochemical cell stack (100), comprises a first treatment unit capable of treating and imparting a first range of temperatures to a process fluid; a filter for removing ice particles larger than a particular size formed; and a process fluid conduit(s) for delivering the filtered process fluid to the cell stack.    USE - For treating a process fluid delivered to an electrochemical cell stack (claimed), which includes fuel and electrolytic cell stacks. It is for treatment of process gases for fuel cell stacks or power modules. It is for fuel cells including proton exchange membrane fuel cells, or any other fuel cell requiring a gas or process fluid to be conditioned, such that the moisture may condense out and form ice particles.    ADVANTAGE - Enhances performance of a fuel cell stack.    DETAILED DESCRIPTION - Treatment system for treating a process fluid delivered to an electrochemical cell stack, comprises a first treatment unit capable of treating and imparting a first range of temperatures to a process fluid, the first range including a temperature below the freezing point of water; a filter for removing ice particles larger than a particular size formed, when the first treatment unit imparts a temperature to the process fluid low enough to cause the ice particles to form; and a process fluid conduit(s) for delivering the filtered process fluid to the cell stack. An INDEPENDENT CLAIM is also included for a method of treating a process fluid, to be delivered to electrochemical cell stack, comprising cooling the fluid to a temperature below the freezing point of water; filtering out any ice particles that have formed due to the cooling step; and delivering the process fluid to the electrochemical cell stack.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded perspective view of an electrochemical cell stack.    Electrochemical cell stack (100)    Anode flow field plate (120)    First gas diffusion layer (122)    Membrane electrode assembly (124)    Cathode flow field plate (130)