The Highest Purity Colloidal Silver 40 PPM spray by Institut Katharos is a game changer for all those in search of exceptional colloidal silver quality. This product stands out with its superior concentration, thanks to its unique technological advancements. The particles are smaller and more evenly distributed, ensuring a strong and consistent antimicrobial effect. What truly sets it apart is its certified purity and efficacy by three independent laboratories. This 300ml bottle is perfect for filling your existing dispenser or you can refill your spray bottle with this high-quality colloidal silver directly.