Hi, when I first moved into my home, I discovered under the carpet was hardwood floors! At the time, my husband didnt want to help me refinish them, so I just took a hand sander and basically sanded off the first layer of stain, then I noticed how badly the floor had water spots. So i decided shop drugs to put a darker stain on the wood to help cover it up. Well, the more I look at the wood now, the more I want to refinish it again, but this time do it right and rent a drum sander. But I dont want to get this big project going, if theres no way I can get ride of the water stains on the wood? I’m afraid the stains in the wood are real deep, and regardless of how much I sand those spots, they wont come out? Am I wrong? If I get a drum sander, would that take care of the problem? Or do I need to put some kind of bleach or chemical to help make the stain lighter so it will match the rest of the floors? Thanks!!