Last Night I had a plumbing service out and they snaked my sewer line. But my floor drain is not draining. I have a sump pump in the same room with three 3in. Line draining into the sump hole I assume one of these is from the floor drain. If not where does the floor drain, drain? And how can I open it up? Will liquid plummer work?

As a repair plumber I have never recommended using harsh chemicals. In your drainage system. Besides they only seem to work in TV commercials and when you try to remove the water you could burn your hands or damage your eyes. Having said that it sounds like your flooe drain's connected to the sewerthe plumber snaked. Some debris from the sewer might have blocked the floordrain branch. Thje solution would be to call the plumber back and have him snake there flood frain line from the drain to the sewer. Good luck, tom

You make it sound like a math problem. I agree with a previous answer, call the plumber back or another one and if you like have them explain your drains process. A sump pump is typically there because the drain that the sump works off is lower than the rest of your system and so it won't work by gravity alone. So if this is the case putting Liquid Plumber in there would be the absolute last thing that you would want to do. You probably have a device inline called a backflow preventer and this would need to be working as well so back to the beginning, get a professional in there who knows what he is doing. Hope this helps.