Sewer Smell from Roof Vent

6 months ago I purchased a 4 year old house. The septic tank had just been pumped. I noticed a strong sewer smell coming fom both sewer vents on the roof then, and it is still there. (You can smell it at a distance from the ground, especially if there is little or no wind.) The toilets flush fine. I've tried different sewer additive treatments with no luck. Do you have any ideas for why this is happening? Also, do you know anything about vent pipe filters, such as the sweetstack? Do they work? Thank you very much. Vent stacks are supposed to remove foul air to the outside, it equalizes pressure so that the fixtures operate properly. What you are experiencing is downdraft from the roof. Those carbon filters you speak of work very well, sometimes frost over can cause the carbon to not work effectively. Most complaints come during the outdoor seasons where people tend to be outside the most. I used some Odorhog filters and my smell dissappeared completely. i am happy. hopefully, I wont have problems with the vents getting iced up and closing in the winter. I ended up purchasing a couple of sweetstack filters, (which appears to operate the same as odorhog filters) and the odor has completely disappeared! Now I can enjoy my outdoor activities. Thank you very much! Are the sweetstack and odorhog easily removed from the vent pipe. I may need to do this if/when they ice over during a cold Iowa winter. Thanks. Usualy what causes this is the stack being in an area of undesirable air flow. Extending the vent stack will usually fix the problem without need for a filter. This method may not be acceptable as it could visually unapealling. Originally Posted by iowa Are the sweetstack and odorhog easily removed from the vent pipe. I may need to do this if/when they ice over during a cold Iowa winter. Thanks. Yes, Iowa, the filters are easily removed. I just black electrical taped mine on at the joints (which was intended to be temporary just in case the filters didn't work) and it is virtually invisible so I'm leaving them that way! Anyway, if they did ice over, you can easily either remove the whole filter, or you can just pop the cap off and remove the piece of nylon stocking with the carbon filter particles inside. Very simple, the hardest part is getting on the roof. Originally Posted by JimmieDee Usualy what causes this is the stack being in an area of undesirable air flow. Extending the vent stack will usually fix the problem without need for a filter. This method may not be acceptable as it could visually unapealling. I tried extending my vents (about 4 feet) just to see if it made any difference. It didn't seem to do anything. The vent filters seem to work perfect. Originally Posted by wanous The vent filters seem to work perfect. Absolutely amazing that my problem could possibly be solved with a carbon filter!! Thanks for writing back wanous! The next question is whether roof plumbing vents should even emit an odor. I have heard arguments for both no and yes. Oh well....some things will always be a mystery! Take care.

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