The spray contains an all-natural colloidal silver which kills bacteria and fungus (see the bacteriology studies). It's made using the highest purity, sterile reagent grade deionized water and contains high purity of 0.9999 silver and deionized water. Concentration: 20 ppm total silver. The MesoSilver Antifungal/Antibacterial Disinfecting Spray can be used in the kitchen, bathroom, and children's room to disinfect hard surfaces. It contains 20 ppm total silver which is all-natural with no toxins or side effects unlike other products on market today!