The group continued according to Issac's plan and soon entered the sewer.
In this world ruled by the spire, the city's sewers were relatively clean. Because the AI paid great attention to the protection of water resources, the moment the commonly used water entered the sewers, the filtering process had already begun.
This set of filtering system was very detailed. For example ... The water discharged from the kitchen and the water discharged from the toilet would not flow into the same pipe, and would not be filtered under the same mechanism. As for the water that flowed out of the toilet ... According to the different exits (bathtubs, washbasins, toilet bowls), the pipes and the filtering system that entered were also different.
This would ensure that all the water that flowed into the sewers met a certain level of cleanliness. After that, the water would be gathered and discharged into the rivers, lakes, and seas that were connected to the ecosystem.
