Sludge is a waste product from some processes that have fluid inputs. It can be reprocessed in a sludge processor into useful materials. Option for oceans and lakes on Nauvis to be salt water which can be purified in a sludge processor into water and sludge. Option for offshore pump to be built on some land tiles which can produce salt water. Includes support for BZ mods.
Mods introducing new content into the game.