Medicines From Nature Colloidal Silver is a high strength ultra-fine particle size bacteriostatic water treatment with a particle count of 100 parts per million and particle size ranging from 0.0001 microns to guarantee effective action. Made from 99.99 percent Pure Silver. Water purity is critical in the Colloidal Silver process. Our water is the purest on the planet after being progressively purified through ten high tech steps as far down as 0.1 microns, excluding even the tiniest microscopic contaminants.