A moisture pump removes moisture from the terrain within its circular range, converting mud, marshes and marshy soil into soil, and shallow water into gravel. Moisture pumps do not affect deep, moving or ocean water. Moisture pumps are most useful in swampy biomes, where patches of ground dry and large enough to build on are few and far between. They also allow for the only non-hydroponic growing on Sea Ice biomes, via transforming shallow water pools into gravel and building a greenhouse above it.
The conversion 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.