eli5: When people used wells for drinking water, how did they not get sick? Was there some type of filter or was the water just naturally clean?
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The ground is a remarkably good filter. The only things that ground water can’t filter out is the pollution from the soil where there are things like huge farms leaching pesticides out into the environment. This is why protecting our freshwater reserves is so important. Groundwater is one of the few water sources that is endlessly renewable because all you need is a rainy day.
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