My understanding may be wrong, but I’m fairly sure I’ve seen water pumps moving up and down or back and forth. Wouldn’t that produce little bursts of water? How does it get so smooth and consistent?
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They’ve got a cool setup. You can see a picture [here.](https://i.ytimg.com/vi/lGF8eVhrD5c/hqdefault.jpg)
The general idea is that as you pull the piston up, you draw some water up from a pipe. When you push it down, you push that water out of the pump while simultaneously filling the upper part of the piston. When you pull the handle out, you push the water out of the top of the pump while drawing water in from the bottom. You can watch this in action at the end of [this video.](https://www.youtube.com/watch?v=2_p6WHZqeOQ) As long as you keep the pump handle constantly moving, you will always have a flow of water.
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