09-28-2016, 10:58 PM
Photo looks like it may be the carpet fiber is going two directions and one side is light and one side is dark. Common problem called shading and pooling. Fiber needs to be rewet and groomed with vacuum or carpet rake. Some carpets are worse than others. Fiber pads and some microfiber bonnets lift up the flat walked on areas and will make carpet look like this until it is walked on again......but i could be wrong looking at photo. Water marks or over wetting will turn fibers brown normally.