I live in the country and on a water well, that has wonderful sweet water. Unfortunately, it is also very high in limestone!, to the point I had to clean my Ninja Dual Brew about every other week I use distilled water for my coffee maker and water kettle due to deposits, which buying by the gallon costs a lot. I decided the way to go was to buy a countertop distiller, and decided on this one and haven't looked back! A great purchase!!