I live in a small town on a municipal water system. A couple of months ago, I came home and took a shower and the water pressure would go from weak to strong about every second. I thought the wife was doing laundry but no. I've been having this problem with water pressure since then, not just on the shower, but everywhere. I thought it was a problem with the city water at first, but no. I've had the meter replaced (one of those new electric ones that is read wirelessly), but that didn't help. Any ideas?