COSORI Electric Kettle(BPA Free), 1.8 Qt Double Wall 304 Stainless Steel Water Boiler & Tea Kettle, Auto Shut-Off and Boil-Dry Protection, Cordless, FDA/ETL/CETL Approved, 2 Year Warranty, White

Hard water is water that contains calcium or magnesium mineral ions often in the form of carbonate. These ions do not pose any health threat, but they can engage in reactions that leave insoluble mineral deposits. Hard water mineral deposits, or...