argentum plus - Colloidal Silver 25 ppm contains silver, which has anti-microbial properties, is a natural anti-septic and disinfectant. We use a state of the art electrolytic process and 100% pure steam distilled water to produce extremely small and evenly distributed ionized silver particles. A relatively high silver concentration of 25 parts per million (ppm) creates a very powerful silver effect: Silver is known to kill over 99% of all known pathogenic germs on contact. This standardized colloidal silver has a proven track record: Regular batch testing since 2005 guarantees its safety and efficacy. 3 year shelf life. Available in 50 ml spray and dropper/300 ml/500 ml sizes. The 300 ml and 500 ml bottles can also be used to refill the 50ml bottles.