The major tasks of the hot gas cleanup program can be summarized as follows: (1) The maintenance and refurbishment of commercial components of the PFB/SGT Technology Rig in preparation for test. (2) The design modifications to the structural, piping and control systems to incorporate the candidate devices into the facility for proof of concept testing. (3) The installation and test of: (a) A felted ceramic bag filter supplied by the Acurex Corporation. (b) An electrostatic precipitator supplied by Research Cottrell. (c) An electrostatically enhanced cyclone supplied by General Electric. (4) The installation and test real-time instrumentation systems for particulate and alkali metals concentration measurements supplied by Sandia and Ames Laboratories, respectively. (5) Installation of a combustor outlet bypass loop and an air reheat loop to expand the range of flow, temperature and dust loading conditions entering the ESP. The test evaluations provided the following: (1) Collection efficiencies of over 99% were demonstrated by both the ceramic bag filter and the electrostatic precipitator, proving the concepts to be technically viable. (2) The continuous reading (real-time) particulate sampling and classifying system was shown to be a viable device, on the down-stream side of the filter where dust loading is low. The results correlated well with the conventional isokinetic probe and filter system for batch measurements. (3) The alkali metal measuring system ran satisfactorily and provided data on sodium (Na) and potassium (K) concentration in the gaseous or solid forms. While all of the devices tested showed promise for application into commercial concepts, they also require continued development to establish cost effective design parameters and the durability required in commercial applications.