A thermal management system includes a space structure (22), a feed water container (24), a water feed line (26), a pump (28), and a filter device (30). The space structure includes a heat source (34) connected with a fluid loop (36) for conveying a working fluid through the heat source to regulate temperature and a sublimator (38) connected with the fluid loop to receive the working fluid. The sublimator has a porous surface (40). The water feed line is connected with the container and the sublimator. The pump is located in the feed water line and is operable to move the feed water from the container to the sublimator. The sublimator is operable to cool the working fluid using the porous surface. The filter device is located in the water feed line between the pump and the feed water container. The filter device includes an adsorbent bed (44) to remove organic compounds.