Plumbing the Depths of Water Pressure To the Editor: I have a couple of suggestions concerning Rex Cauldwell's "When the Pressure's Off " (Kitchen & Bath, 3/94). He recommends a backflow preventer and a pressure regulator as the first step to mitigate erratic city water pressure, and then a pump and storage tank if that isn't satisfactory. I'd suggest an intermediate step: Try adding just the pressure tank without the pump. It may moderate pressure swings enough to make them acceptably unnoticeable, saving considerable expense both up front and in electricity. If a pump is necessary, he recommends an additional pressure regulator after the pressure tank, but I'd suggest either removing the first regulator, or setting it above the pump's cut-out pressure.