The water molecules have the boiling point of 100°C or 212° Other substances have different boiling points.
To eliminate organic problem substances, the water distillers have pre and post water filters. Let me ask you something. What’s happening in distillation process, is that the case? Substance that boils at a lower temperature evaporates first. Furthermore, if the water contains the oil drops they can be found also in the distillate. Organic substances, that have similar boiling point than that of water can slip in the distilled water. Various boiling point impurities is higher, when the water has already boiled out. As a result, theoretically, they will begin to evaporate. Here’s a question. Now let me tell you something. Look, there’re practically no salts in the distilled water, as long as the salt boils at a much higher temperature. Theoretically after the distillation the absolutely pure water is obtained. Consequently, fact, since this difference the water is separated. It is the substance that boils at a lower temperature evaporates first.