The UEBERALL USS-15 is a compact economic equipment that is used to keep bacteriological control over water storage tanks.

Silver ions are added to water in a concentration of 0.05 to 0.1 mg/l. The silver ions act as an (oligodynamic) germicide

 

In ancient times in Mexico, water and milk were kept in silver containers . Silver was also mentioned in the Roman pharmacopoeia of 69 b.c.