It was not an ordinary sewage treatment tank.
It was a special kind of equipment similar to a reaction vessel.
The thickness of the outer wall of each metal tank exceeded that of a main battle tank's reaction armor.
During the operation, large amounts of chemicals and gene reagents had to be injected into the pool. That barely neutralized and diluted the experimental residue, monster feces, and various waste materials, enough for it to not cause serious damage to the environment or leave any traces behind.
The valves on top of several metal tanks were creaking and emitting hot scarlet steam.
It was hard for Meng Chao to imagine what kind of dangerous substances they were dealing with that required them to be so cautious as if they were facing a great enemy.
