Inspired by a documentary exposing the "billion dollar hoax" of bottled water, Chris, a science teacher, proposes a fascinating project: a classroom water showdown! Students will test bottled and tap water, uncovering the truth about their quality and environmental impact.

This project is not just about data, it's about sparking critical thinking and environmental awareness. Students will learn by doing, experimenting with water testing kits and delving into the science behind different contaminants.

What can they test for?

1. Basic properties: pH, temperature, and conductivity can reveal initial differences in acidity, mineral content, and potential impurities.
2. Chemicals: Chlorine, nitrates, and lead are common concerns. Kits typically offer tests for these, highlighting potential health risks.
3. Microbial contamination: Bacteria tests can shed light on the presence of harmful organisms in tap or bottled water that may have gone through inadequate treatment.
4. Microplastics: This emerging concern deserves attention. While most kits don't directly test for microplastics, students can research filtration methods and discuss potential dangers.

Testing kits:

While Flinn and Carolina focus on natural water testing, several online retailers offer kits specifically for bottled and tap water. Popular choices include:

1. Watersafe: Affordable and easy to use, with tests for chlorine, lead, pH, and hardness.
2. Varify 17 in 1: More comprehensive, including tests for bacteria, pesticides, and iron.
3. H2O OK Plus: The most complete kit, analyzing 23 parameters like nitrates, copper, and fluoride.

Beyond the data:

Encourage students to research the environmental impact of bottled water production and transportation. They can compare the carbon footprint of bottled water to local tap water, considering factors like treatment and distribution.

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