I have an issue and I needed to know what might be the problem and how to solve it. I have duplex that is about 22 years old and every 5 minutes or so I can hear the water running(from the pipe) like the toilet was flush and it was refilling but that was not the case and when I checked the toilets I didn't see any sign of leaking in the bowls . The noise can be hear in both side of the duplex. It is a septic Tank system. Any ideas?
Your help will be greatly appreciated.