If your hardwood floor has major problems, such as deep discoloration, protrusions, and grooves and pits, the only way to restore the floor to its original glory is with a drum floor sander.
Floor sanders come in three distinct types: edgers, orbital sanders, and drum sanders. A floor edger is essentially a powerful, super-sized orbital hand sander that allows you to sand next to baseboards and walls. An orbital floor sander is even larger and more powerful than the edger, but both operate by randomly and rapidly moving a single sheet of sandpaper around the wood.
A drum sander is a completely different tool in that a loop of sandpaper continually moves around the drum, ripping down the wood as far as you want to go.
With an orbital floor sander, it’s hard to go wrong, since it’s difficult to take off too much wood. By contrast, a drum floor sander is strong enough that it has the potential for going in two wildly different directions: either ruining your floor by creating grooves that can never be repaired or sanding out major imperfections to make your floor look spectacular once again.
Even though it’s possible to rent a Drum sander and do it yourself, we strongly recommend you to hire the help of a professional company to restore your hardwood floors using such equipment.