We recently installed a garbage disposal (this past Monday) and earlier this evening the kitchen drain was all stopped up. I don't know that the garbage disposal has anything to do with it or not, but it seems quite coincidental if not.Using the "jam busting wrench" wrench found no resistance and didn't help, so I tried a plunger (vigarously) and got nowhere. I slowly unscrewed the pipe connections under the sink and allowed the water to drain out into bowls. Pulling apart the pipes I found no clogs to be found, perhaps a little gunky but pretty well open drains.I found a ~6 foot long siphon we have from when we used to have a fishtank and I placed it into the remaining pipe going into the wall. I can see with a flashlight that it is getting past the turn and heading downward, and I can get all 6 feet into the pipe without hitting an obstruction.We used the siphon to run some liquid plumr down the pipes... After two rounds, totaling about a bottle (including one we let sit for an hour) Ive now gotten to the point where I only have a slow running drain. It takes a good minute or so to back up into the sink and then it does drain slowly. Better, but not good.I've used the 6 foot siphon as a cleaner to pull a bunch of gunk out of the pipes and I now have my last half bottle of liquid plumr working down the drain. If that doesn't work, what's next? Anything other than calling a plumber?