A moisture pump slowly removes moisture from nearby terrain, always providing buildable and sometimes arable land. Once built and powered, its radius expands continuously (approx. 8.7 days per tile radius), in a circle up to a maximum of 6.9 tiles after a year. Once their radius expands, their effect on the terrain is permanent. Moisture pumps continue to draw power once they've reached their maximum radius. Moisture pumps cannot be manually turned off and must either have their power source disconnected or be deconstructed to stop them drawing power.
Moisture pumps may be built on bridges, greatly expanding the land that they may affect.
Mud, marsh and marshy soil are converted to soil. Soft sand is converted to sand. In all but ice and sea ice biomes, shallow water and shallow ocean water are converted to stony soil. In such biomes, they are converted to ice. All other terrain types are unaffected by moisture pumps.
They require Moisture pump research to be built.