If you have a damaged sewer drain, you may be lucky enough that it can be fixed by relining. This is a quick and easy solution that won’t cost you the world. Sewer relining, like drain relining, involves inserting a flexible pipe liner containing resin into the drain pipe, then a bag of air in the lining to mould it to the pipe shape. It is heated and then cooled to set the moulded shape. The bag of air is then removed and the drain has a new inner lining, allowing it to function as it should.