This past weekend I noticed that my water pressure pump was kicking on every 10 minutes or so and noone was using the water. At first I was worried about a leak so I turned the valve off right after the tank. Even then watching the guage I could see the pressure slowly going down in the tank from 60 to 40 psi and then the pump qould kick on and recharge it. This is new as the pump never used to run if the water wasn't used. My thought is the bladder inside has broken and lets the air leak out. Does that sound reasonable for the issue I'm reporting? I can add more air in the tank but I doubt that would change anything. Everything I find online talks about an almost constant cycling of the pump when the tank breaks. A multiple times/minute type of thing which mine doesn't do. I took a look at the tank and all that I can find on it for markings is PMD-20 Water Systems - Div SI inc Charlotte N.C. It's bright blue with a black base. Looking online I can only find a few hits on PMD-20 and I can't figure out what the company name actually is. Does anyone know anything about this tank? Can I replace just the bag or am I buying a whole new tank? Is it possible the pressure is going backwards through the system and the problem is the pressure pump? Is there a one way valve somewhere in the system that could be failing? I can totally seperate the tanks from the water system with valves and test this "back flow" possibility tonight.