Boniour everyone, We've just bought in Pas-de-Calais in countryside between Le Touquet & Monteuil-sur-Mer and have a fosse septique - the local mairie's office can arrange for it to be emptied F-O-C once every two years if req'd. In our case a farmer turned up with tractor and tanker trailer. However, he and the local plumber siad there must be a second tank as the one he emptied did not contain foul waste and appeared to be connected only to the kitchen and bathroom NOT the toilet. The reason for asking for the tak to be emptied was a slow flushing loo - still the same of course Tge previous owner says there is a second tank that "never, never, never needs emptying" and in the 22 years since the house was built for him they've "never , n...." had any problems. Can anyone help me with the concept of a never emptying tank please? Thank you Rowland