The research focused on using a special light technique to quickly check the cleanliness of water. Scientists collected water samples from different places like a wastewater treatment plant and a fishpond. They used a method called near-infrared spectroscopy to measure things like how clean the water is, the organic material it contains, and its acidity level. By analyzing the data, they could estimate the levels of chemicals in the water, like oxygen demand and pH. The results showed that this method is very good at predicting these water quality measurements. This shows that near-infrared spectroscopy could be a useful tool for checking different factors in water quality all at once.