I\'m out of the country and my aunt told me how deodorants have chemicals that have been linked to breast cancer, so she turned me on to using a crystal, here it\'s called Alumbre, and from what I\'ve been googling, it\'s called Alum in the USBut now from what I\'m reading it\'s not as safe as we thought because it may contain aluminium, but apparently there\'s different kinds and some are safe and some aren\'tI\'m just wondering if mine is, it\'s just called Alumbre here, and they just gave me a bunch of these quot;rocksquot; in a clear bag.When I played drums it would be mattresses and heavy drapes against the wallThere are solid doors and special windows for thisOther related question