The present invention discloses a composition based on Mn+ and CO32 as well as Mn+ and SiO3 for enhanced biocidal property of transition metal ions in water, especially biocidal property of silver and copper wherein the composition comprises of Na2CO3 or K2C03 as a source for CO32. Composition in its individual capacity (either Mn+ or CO32 or SiO32 alone) doesnt offer significant biocidal ability in diverse conditions of drinking water quality. However, when two components are combined (Mn+ and CO32, represented as Mn+/CO32), the composition offers new and improved antimicrobial properties which are hitherto unknown. Composition nullifies negative effects of various interfering species present in water on the biocidal property of silver. The composition (Mn+/CO32 and Mn+/SiO32) is demonstrated for use as a water purification device for the fast and complete inactivation of microorganisms and as a marker for the replacement of the water purification device upon is effective life.
