CONCENTRATION ADVISORY: While TDS meters can be used, they will not represent an accurate measurement to test concentration. Inexpensive TDS meters are designed to measure generalized impurities of a liquid, not high quality small-particle silver particle concentrations. Independent laboratory certification tests confirm 30ppm while testing just 10-14ppm from an easily obtained TDS meter. Family owned & operated in Arizona USA - Dedicated to producing the best products, all made in USA SilverGuard Guarantee - 30 day return if any reason you are unsatisfied with your purchase Unique oxygenation & agitation process produces silver consistently measuring 0.5-2 nanometers to allow for lower dosage and maximum effectiveness Hexagonally Structured 30ppm Colloidal Silver Increases Absorption & Boosts Overall Effectiveness Potential Uses: Take internally as an immune system booster | Spray on wounds, burns, and other skin ailments | Spray on a dry bamboo cloth to help with diaper rash | Colloidal Silver mouthwash, or spray directly for tooth and gum health | Vaporize with nebulizers, misters, and diffusers | Throat spray for sore throats | Pets - apply to wounds, add to water bowls to keep their water fresh as well as boosting their health | Plant feminizing spray | Purify water by adding 2 tsp/gallon Non-leaching amber BPA-free plastic bottle.