Despite the stains being left on the inner base after the initial cleaning of the Vevor, I am very pleased with this distiller. I clean it after every use and so far there are no additional stains.It takes a little getting used to the taste of the water at first because it tastes so pure but one soon gets used to it and really appreciates it.I was dubious prior to choosing the Vevor as it is more cost effective than many others but I am so glad that I chose it.Easy to use, 4 ltrs of gorgeous waterand cost effective!