The goal of the sanding process is to remove the top layers of wood to remove wood stain, scratches, indentations and defects on the floor that arose from normal wear and tear. Using different grit levels will create a smooth surface onto which a stain color will ultimately be applied.
Sanding is a natural approach to removing the surface of hardwood floors as compared to using harsh chemicals to strip older finish. Depending on the type of sanders used, sanding hardwood floors can create a dusty mess. This is especially inconvenient as dust can enter air ducts, electrical outlets, and collect on fabrics and other surfaces. Thankfully, professional hardwood floor refinishing companies like Fabricio Hardwood Floors use dustless sanders that sucks and contains dust to minimize / eliminate any mess.