[Incorrect] Water erased from bugged drain

I saw the drain connected to my contaminated water pipeline had an extra piece of pipe sticking out underneath it. After deconstructing it, the drain now "spurted" when water was supposed to have come out of it, but none did. The drain dropped bottled water when I deconstructed it.

[] EDIT - It's supposed to spurt according to what I've now figured out. My water level is dissipating, so I didn't know if that was the problem. This is supposedly not a bug, and just that the water is so little that only droplets come out of the pipe.