We have just returned from our first week in our new residence secondaire and think we have a problem with the fosse septique. The previous owner told us that it didn't need emptying and that we were to feed it with Tarax once every six months. However, there is a strong smell coming from that area of the house and having hunted for a vent pipe from the fosse septique we can't find one. I don't know anything about them so is there anyone out there who can give me some guidance? I think I need to know what makes up the system ie should we have a vent pipe, how is it plumbed, etc. Also, is there a website that anyone has come across where I can get plans of a fosse septique or does anyone have some plans that they could photocopy and send to me? Thanks.