Customer wishes to have toilet on loading dock replaced. They currently have a flush assist toilet and wish to have it replaced with a new toilet with the flush assist tank Installed new Sloan pressure assist toilet. upon removal of existing toilet we found that the flange was installed at an improper height which resulted in us having to add shims to toilet to level out and keep from rocking. If customer continues to have issues with toilet, we recommend lowering flange height to allow for proper installation