pot_outlet -> container -> pump -> water_sink
container -> sensor
controller -> sensor
controller -> pump

┌──────────┐┌──────────┐
│pot_outlet││controller│
└┬─────────┘└┬┬────────┘
┌▽────────┐  ││         
│container│  ││         
└───┬────┬┘  ││         
    │    │  ┌│┘         
   ┌│────│──│┘          
┌──▽▽┐┌──▽──▽┐          
│pump││sensor│          
└┬───┘└──────┘          
┌▽─────────┐            
│water_sink│            
└──────────┘