Re: I don't understand what they're saying here...
While we are talking pressure, perhaps you could pop on over to johannes' thread on the Mysteries of the Multiverse Board and help him grok the concept. I grow weary of the task.
Our irrigation system, which drops forty feet down hill, has a whopping 100 psi at the bottom of the hill. Our houshold psi is 70, which is too high, and I need to get the plumber back to fix the pressure regulator. But I do like the strong shower!