"Sample from the treated drainage of this facility. It shows it has passed the water pollution test."
"A device to check the water quality. A Water Sample seems to be required." message can be read by Jill, when she explores water checking device in the Water quality examination room. There is another checking machine next to it, that reads the message, when it's explored: "Water pollution alert... Blocking of the abolition area passage is now in progress. To maintain safety, the lock will not be released until a manual check has been performed."
After solving the water test puzzle, the water device will show the message "Water quality check has passed the safety level." and after checking it again, the message will be: "Water check: OK.".
When Jill sets the sample to the device, it disappears from the inventory.