Abstract: An apparatus used for analysis of a fluid-based system that includes a main chamber consisting of an optically transparent high strength material that ensures transmission of infrared and ultraviolet wavelengths and is capable of withstanding high pressures. The apparatus also includes first and second fluid tight endcaps attached to first and second ends of the main chamber, wherein the first endcap permits entry of a fluid into the main chamber and the second endcap permits the fluid to exit the main chamber. The apparatus further includes a fixed filter guide rail located inside the main chamber and attached to one of the end caps, and a filter located inside the main chamber and configured to removably attach to the fixed filter guide rail, wherein the filter is capable of capturing residue or contaminants in the fluid.