Hi all. I recently had had leak from a split flexi hose from my bath. The Plummer had to pull the bath out to get at the hose and fix a new one. Ever since the bath went back in it's draining very slow. Almost not at all. I've tried the chemicals and taken off the u bent waste pipe but there is no blockage. Before I had work carried out the bath drained fine. Any advice as this is very frustrating.