septic vent odor coming from roof Home › Forums › Public Forums › General Plumbing › septic vent odor coming from roof This topic has 1 reply, 2 voices, and was last updated 20 years, 9 months ago by Retired plbg1. Viewing 1 reply thread Author Posts 10 Jul 2003 at 2:30 am #276750 conehead Can anyone tell me how to make an activated charcoal filter to stop the annoying oder coming from my roof top septic vents? Also where can I get the necessary parts, especially the charcoal? 10 Jul 2003 at 10:30 am #294719 Retired plbg1Participant You can dig up pipe and put in trap thats what i did. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In