Remove existing anode rod or rods. Drain out 2 quarts of water from water heater. Add 2 pints of 3% hydrogen peroxide (available at drug stores) through anode rod hole. Install an aluminum zinc rod, or power Anode. DO NOT plug in power anode until tank is pressurized. Pressurize water heater and let stand 20-30 minutes. Purge all of the hot taps individually until warm water comes out of the tap. Finally flush heater under pressure through drain valve for 5 minutes. To achieve superior results install a curved dip tube and full port ball valve for a turbo flush. Your customers will love the results.