The KA-90 Smelly Water Anode Rod is a great alternate to the standard aluminum and magnesium anode rods that normally are installed in most residential water heaters.  Although the KA-90 has a great success at resolving smelly water situations it is important to note that all water conditions are different and vary from municipality so a professional should be consulted to see what they have best success with in your area.  The KA-90 rod is composed of mostly zinc with tin and aluminum components and is less likely to react with water while still providing cathodic protection for your water heater.