SD Pro is a nontoxic, persistent antimicrobial coating that is made from only US EPA Approved ingredients. Our bonding is so strong that the non leaching surface retains antimicrobial activity for at least 6 months; this means the treated surface can stay anti germ continuously for 6 months! SD Pro works by binding nano antimicrobial spikes, molecularity, onto object surfaces so that viruses, bacteria and germs get physically ruptured when they come into contact with the treated surface. The product has undergone abrasion, safety, effectiveness and more than 100 independent laboratory tests by leading laboratories around the world. Our retail product, SDST, comes in a 180ml bottle and can last 90 days.