I want to install a water softener in the basement of my house. It is a walk out basement. Home was built 7 years ago. There appears to be a rough in for a bath. I see 3 pipes coming from floor that are 1 and 1/2" diameter. They are about 18" tall, and come up next to wall. I see another pipe that seems to be 1 and 1/2" diameter, but is away from wall, and only a few inches from floor. There is another pipe that is 3" diameter, and a few inches tall. There is a floor drain about 8 feet away that drains my furnace. I would like to use one of the pipes running closest to the wall for my discharge from water softener. I am clueless as to what I need to do to make this possible. I could use the existing floor drain, but I would have to run the drain hose across the floor. Any help would be appreciated.