The charcoal filter was installed new with the chlorination system so that should not have bacteria. The softener is bypassed so no water is going through it. I don’t think there are 2 anode rods. Where would a second one be ?I know I read about 2 anode rods but can’t seem to find it now. I can post details and pics of the heater later. All plumbing is pvc. The cold water does not smell so is not picking up bacteria in the lines anywhere unless it gets picked up in the lines and has time to sit in the heater, causing it to smell.