Arrived on site and inspected bathroom with sulfur smell in water and tested all other fixtures. Smell only persists on hot water side. Customer has filtration and softener system in place which is operating properly. Water heater is an AO smith notorious for failed anode rods and customer said this has been an issue since they moved in 9-10 years ago. Recommended replacing with Rheem 40 gallon electric for cost effectiveness and due to age of water heater. Also gave estimate for anode rod replacement. Customer will speak to his wife when she gets home and contact us if they wish to go through with either estimate. Emailed all estimates to customer. Customer satisfied with todays service.