We have been experiencing a problem for the past several months with our Master bathroom shower. Everytime we turn on the water there is an awful egg smell odor that is exasperated once the water is turned on. Can't seem to find the cause. Replaced the shower head which helped significantly for about a week and now the smell is back. Could you recommend some ideas to help resolve this problem. Tried draino and some other products. The drain is not backing up at all so no issue there just a horrible smell. Next resort is to possibly try some enzymes to see if that works.