I have bought a VEVOR too about a month ago. The filter is necessary to clean the water from the impurities. The distillation by itself is not enough. After a while I get used to the taste and it diminishes after about 10 times distillation. Hope this helps...
This is what confuses me. What impurities make it through the distillation process? I only have a high school level understanding of chemistry but it would only be liquid compounds with a boiling point lower than 105? All the dissolved minerals should be left behind when the water boils?