As per PCB, what is the reason for the change in colour to the poor quality of water?
पसब क अनसर, पन क खरब गणवतत क लए रग म परवरतन क करण कय ह?
<bos><start_of_turn>user
As per PCB, what is the reason for the change in colour to the poor quality of water?<end_of_turn>
<start_of_turn>model
पसब क अनसर, पन क खरब गणवतत क लए रग म परवरतन क करण कय ह?<end_of_turn>
