Water Generator is an active bloc which spawn Water voxels around it. The nearby locations must be empty for Water to spawn. At best, Water Generator can spawn 6 Water voxels per cycle.
Green Acid Generator is an active bloc which spawn Green acid voxels around it. The nearby locations must be empty for Green acid to spawn. At best, Green Acid Generator can spawn 6 Green acid voxels per cycle.
The Sewer System is an active voxel allowing evacuation of liquids. It's manufacturer claim that this is a very modern system that generates absolutely no pollution on site, the waste being teleported randomly in the garden of someone else.