Today, the participants put what they had learned into practice. First, they filtered the cloudy water they had brought with them using a simple fabric – such as a T-shirt – to remove coarse particles.
They then prepared a saturated saline solution. Following precise instructions, this was mixed with water and electrolyzed over several hours. This produced sodium hypochlorite for drinking water disinfection.
Finally, the groups determined the concentration of the solution and calculated the amount needed to treat a 20-liter canister. Just a few milliliters are enough. After about 30 minutes, the contaminated water had been turned into safe drinking water.
