Water quality monitoring currently occurs mainly at water supply intakes or water treatment plants, rather than along water distribution lines or at the point of use. This is inadequate because negative changes can occur in water quality between the water source and your faucet. It is essential to monitor this key natural resource for various contaminants, such as toxic heavy metal ions, within water distribution and treatment systems.

Via:: https://phys.org/news/2017-11-sensor-real-time-heavy-metals-bacteria.html

New sensor provides real-time detection of heavy metals, bacteria, nitrates and phosphates in water

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