more junk in my garage

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water pressure, or lack thereof

Our water pressure is very low. Before we called in a professional, to see if anything can be done, I thought I'd try turning up the pressure on the pressure tank. There's a pressure gauge. There's a box with an electrical block and a screw. That's it. Do I turn the screw? Which way?

Anyone have any idea what's up with pressure tanks?

EDIT:
There are instructions printed on the underside of the the cover. I turned a screw, and raised teh pressure. But I should have done a little more investigation ahead of time, to determine what it was to start with. The gauge read 45, but there's a 15 or 20 psi differential.

Dan Savage says:

Last week, the pope condemned divorce, masturbation, birth control, in vitro fertilization, living together before marriage, and same-sex marriage. According to Bennie, all of the above add up to "anarchic freedom." The headlines the next day? "Pope Condemns Gay Marriage As 'Anarchy.'" The headlines should have read something like this: "Pope Condemns Majority Of American Heterosexuals For Private Sexual Conduct; Also, Gay Marriage."