Bacteriostatic Colloidal Silver. 50mg/ltr Silver in activated de-ionised water. Healthy Aim Colloidal Silver is regulated to 50mg/ltr strength to ensure a bacteriostatic condition where disease-causing micro-organisms cannot grow and multiply. To sanitise water: Add 4 to 5 drops into a 250ml glass of water and let stand for 10 minutes. Store away from sunlight at room temperature.