Not sure if this would go in this forum or the pieces forum... so feel free to move if it doesn't belong here!
But anyways, I've been in the market for a new bong, and I would like it to have a percolator. However, I have never seen a bong with percolator in person, only read about them and saw pictures online. My main question for the city is: How do you fill up a bong with 1 or more percolators?

Do you have the fill up the bottom through the stem, or can you put the water in right from the top, and it will all even out on its own? For example, in this picture (
http://www.420magazi...30148058239.jpg) the water is in the perc, stops, then has water in it again. I guess I just don't understand how this happens. I tried searching for similar topics on GC, but I didn't really find any besides 1, and it didn't help much.
I'm sure if I had seen one in real life I would understand, but... that's not the case

Thanks in advance!