I also use Tupperware, but there is a layer of white powder after the water is boiled, which will not disappear for a long time, indicating that it is not bubbles, but still sticks to the glass of the health pot (I used to use a kettle, so I changed it every day because of too much scale). I have to clean it every day when I see a layer of white powder, but every time I clean the pot, a layer of white floating objects appears when the water is boiled, which is really unpleasant to drink. How many times have I asked Tupperware and explained that it is normal. Can it be normal? It is really unpleasant to spend so much money. I wonder if it is harmful to people. I wonder if people who are useful to Tupperware feel the same way? ! ! ! Besides, I just bought a new one. I used it for a year and changed the filter element. Water has always been like this, which means it is not a filter element. This has always been my concern. Can someone explain? Thank you very much