Did you know that the Great Wall of China was once fortified with brown water? Not literally, but ancient builders used sticky rice and lime mortar, which sometimes gave the walls a tan hue. Same color, different problem.
Another fun one: the world’s oldest toilet, discovered in China, is over 2,000 years old. It almost certainly had brown water issues, too. Some things never change.
And here’s a golden nugget: the brown color in your toilet is usually caused by iron-oxidizing bacteria, the same microbes that turn lakes orange. They’re harmless to humans, just visually dramatic.
