I dumped a bucket of water into my bathroom sink (nevermind why, that's a whole other can of worms), and afterwards my sink has started having problems. It hasn't been draining properly. I'll wash my hands and the water will stay in the sink not draining at all. Then I'll come back later and the water will be gone. Then I'll come back later and the water is back again. This must be a result from me dumping the water into the sink, because that's when all this started. Maybe the pressure of all that water did something? I'm going to give an illustration of what I think is wrong, and maybe someone who knows about plumbing can tell me if this makes sense. Ok, let's say you have a pipe that's curved like the letter J. You pour water into the bottom part, but the water will stop going in at a certain point, because it's not going to climb up the pipe, so it will appear like it's clogged, but it's not. Is that what could be happening in the piping of my sink? For some reason the pressure of the water caused something to change so that it just won't flow? Thanks.