: : I have septic odors coming from my roof vent, but only notice them during cold weather. Have seen mention of a filter that can be atached to the vent. Do they work? And, where can they be found?: Check the height of the vent. Is it too low to the roof, is it near a window etc. In cold weather the odours will hang around longer. Have you put too much household disinfectant or cleaners into the : tank and killed off the bacteria. A properly working septic tank does not give off much odour.
