We have iron rich water In our home. To combat it, we have a salt softener system and also a greensand system. Recently we flushed the hot water heater, changed our adnode rod etc to rid the water of the sulfur smell. It worked for a while but the smell is back. Do you think I should put some hydrogen peroxide in the in-line filter to flush the hot water heater? Is bleach a better option? Any other suggestions? We have had this smell for years and I can't seem to control it b