There are two reasons why there might be a line running along the length of your new carpet. The first reason is known as a pole mark and is caused by the pole that the carpet is tightly wrapped around during transportation. These indentations are normally found close to a wall and should fade away as the carpet becomes acclimatised to the room. You can help to speed up this process by regularly vacuum cleaning the line to bring the pile back up. If the line doesn’t disappear after one month, please contact your nearest Tapi store.The second reason is known as a line fault and is caused by an issue in the carpet manufacturing process, resulting in a visible line of higher pile along the length of your carpet that won't disappear over time. If you have a line fault in your carpet, please contact your nearest store and we'll arrange for the issue to be rectified.