Our kitchen sink drain has been "slow" ever since we've bought the house last April. However over the last week or so, it has almost completely stopped draining at all (and the water is smelly) I have had just a friend come over and snake it previously, but I got desperate today and decided that I would try it again and I also tried one of those Drain Bladder things tonight and low and behold here comes water shooting out of the pipe on the roof ? I have accepted defeat and am willing to call a plumber, but in the meantime (so I don't get totally ripped off) I would like to know what it could possibly be. Any ideas... anyone... please??