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Thanks, guys. To clear crud from the pressure switch nipple requires draining the tank (so I can temporarily disconnect the switch), correct? Meanwhile, I took the housing off the pressure switch. It's a Square D, with diagram and instructions: Screw #1 CW to increase cut off and cut on...

This seems to have started rather recently... when running any sink or shower, the water pressure will drop real low (water still comes out, but very low flow) for 5-10 seconds, then picks back up to normal again. Happens approximately every 5 minutes while water is running. We're on...