Rain water is not clean water

Some places still use rainwater as food

In the past, when scientific knowledge was still not universal to people, people living in poor and backward regions believed that rainwater was the cleanest, so it always stored rainwater to use and call it ' water heaven 'or' fairy country '.

Actually rain water is not clean. When we look at the sky, we see nothing, but in reality it is not always full of dust and a large amount of bacteria. When the rain falls, some dust and bacteria will stick to the raindrops. Near areas with large factories, more toxic smoke emissions and more harmful health gases, rainwater in these places is also more dirty. Recently, because the environment on the earth has become more and more seriously polluted, rain water is not as clean at all. Not only is rainwater not clean with river water, but even well water or groundwater, rain water cannot match.

At present, many places have used treated water but if in areas with particularly difficult conditions forced to use rainwater, it is necessary to undergo the process of sedimentation of rainwater and then cooking can be used.