l Magnesium or
aluminum anodes are called sacrificial anodes, they protect tank from corrosion
by losing their mass in water.
l When a
magnesium anode is used up, the tank is in danger of being corroded by
water.
l So replacement
of used-up magnesium anode is a must and this costs a lot during the work time
of water heater.
l Why to use powered anode systems