A moisture pump removes moisture from the terrain within its circular range, converting mud, marshes or shallow water into dry ground. Mud and marshes are converted into soil, while shallow water is converted to gravel. Moisture pumps do not affect deep nor moving water.
The removal starts from the center and slowly expands outward.The info box will provide progress tracking. The effect is permanent, so you can safely dismantle them once the terrain is usable. Its effect radius is 6.9 tiles, and takes 1 year (4 quadrums) for it to fully expand.
It requires Moisture pump research to be built.