We've been having issues with our washing machine recently where it is filling up in the drum overnight with clean water. I just went to look underthe sink to check (actually don't know what I was checking for!) anyway I knocked a small blue lever about 1/4 turn and all this water came gushing out. I have now switched this tap back to off position Should there be something at the bottom of this pipe?? Also washing machine is all plumbed in correctly further along the pipework close to back of machine, so does anyone know why my machine drum is filling up?