Potassium Alum is a natural mineral salt used as an alternative to Aluminium Chlorohydrate/Chloride. Alum’s antimicrobial properties have been celebrated for hundreds of years, with applications including topical astringent, an antiseptic for wounds, acne and tonsillitis, and a toner to tighten the pores.While Potassium Alum (also known more commonly as ‘alum’) is from the same mineral family as Aluminium Chlorohydrate/Chloride, it is a very different material.Potassium Alum is comprised of large molecules that are unable to penetrate the skin barrier. In contrast, Aluminium Chlorohydrate/Chloride is comprised of much smaller molecules that are absorbed by the skin, plugging sweat glands, and preventing the release of unwanted toxins from the body.