New method allows water pollution level to be detected in 200 seconds ArirangNews 0 109 2024.10.21 19:38 https://www.youtube.com/watch?v=aA8OiK6xnnY + 133 https://www.youtube.com/feeds/videos.xml?channel_id=UCzznO4xSV8BKnUBPy… + 19 New method allows water pollution level to be detected in 200 seconds