Re: RO water question

Can any of you bright heads explain why; when I am in Thailand or Greece or other countries where I have to drink RO water.. why do I get the kind of gritty feeling on my teeth, like if they are covered with insoluble calcium or something?
Cant get it off by brushing the teeth, but as soon as I change to some "natural" mineral water (pelligrini, glacier etc) water, it disappear quickly.
Have never tried distilled water so I cant compare. Tweet