I know this has been a topic of discussion in the past. We are getting sulphur smell when turning on the shower
this is what I have done with no 
results. 

changed perfectly good Anode Rod and installed one purchased from G&L at the rally. Flushed entire water heater. No Difference. 
purchased new anode rod like previously used, no difference. 
Appreciate any thoughts or ideas on this topic. 
thanks in advance.