Wiser2

Good afternoon all, my wife and I just purchased a 2005 Roadtrek 210 popular with only 27000 miles on it. We believe it was a score deal. Unfortunately, the party that we purchased it from had Alzheimer’s pretty bad, and was not able to go through the unit and answer all the questions. We are very accustomed to RVs how they work with the exception of macerator pump. I know that one lever is for Blackwater. One is for the gray water and there’s one more lever on it that I’m not sure what it does. If there’s anybody out there that could help answer this question. It would be greatly appreciated.