The idea of the method of relining pipes for waste water and drainage with the aid of plastic was conceived in 1989 by the Proline Group's founder Sten Edström. As an enthusiastic boat owner, he realised that plastic, which is as good at keeping water out of a boat, should also be used to keep it in pipes and drains that have seen better days. Sten Edström was passionate about his idea and devoted years of strenuous work on developing it. The idea was patented and the business was established in earnest. The first relining project was carried out in Gävle in 1995, the rest is history.