about 4 years ago - Avanya - Direct link
For water and sewage, you always want to connect them directly to the grid and not through each other. So it should look like this:

https://steamcommunity.com/sharedfiles/filedetails/?id=2223944780

Connecting like this will cause problems:

https://steamcommunity.com/sharedfiles/filedetails/?id=2223945379