Well pressure tank
I need to adjust the precharge in my well pressure tank. It is located in my crawlspace, lower than any faucet in the house, and does not have a drain plumbed into the line. In order to actually drain the tank, I would have to undo the feeder line (PITA). Do I need to drain the entire tank before setting my precharge to the 2 or 3 lbs under my cut in? Or, can I just shut the well off, turn on a faucet to drain the pressure, and then add air to the right pressure?