The roots of hardwood trees that have been submerged in water for a while are known as river root wood. Although it hasn't been preserved like real bogwood, it has been soaked for a long enough period of time to stop tannins from leaking out. When positioned on a light-colored substrate, its dark brown to black coloring can be quite striking. Your pH won't change at all. It is a good option for keeping catfish species that consume wood. The Kg sold