Sean learning how to clear a drain
Its basically a drill with a special fitting on the front that contains a flexible metal hose with a special tip. You put it down the drain, 4" at a time, and spin it, and it clears whatevers down there. Most of what gets into the drain is a fine sediment, mostly dirt. I rented this thing from the local hardware store a few times, and then finally decided to buy one. They work great.
Next time I put in floor drains for a barn, however, I'm going to do something other than a 2" line. Maybe a full-on 3" or 4" line would work better.