The sacrificial anodes in home water heaters are made of magnesium and with well water will sometimes cause a rotten egg smell . The anode for an Attwood water heater is an aluminum alloy . I installed a Camco anode in my
Scamp water heater , no rotten egg smell , the anode has a built in drain valve which is very handy , and it is cheaper to replace the anode than the water heater.