I have about 7 meters of PVC pipe connected to the water meter. Some of this pipe is above the meter level so some air sure gets trapped inside.
Is it possible that the air in pipes expand and contract changing the meter reading? In a 24 hour period, my meter registered 50 liters of water. I checked the pipes many times and haven't found any leaks (the pipes are exposed). At that rate the leaking should be pretty visible, right?
I was watching the meter now (noon, full sun) and I could see it registering some hundred ml in a few minutes, but no drops anywhere.
Best Answer
It is a long time ago since you posted your comment, but I will answer anyway, as I believe it can help many people. I live in Brazil, and here we have had many issues like you described, due to changes in the pressure of water supply company. It makes that much air comes into the piping, and when this trapped air comes to the home meters, it is registered as a normal water flow, and you pay for it. Some small companies here have developed a kind of a valve that blocks this air, and keeps it trapped before your meter, while permitting the water to pass. This is reducing the water bill for almost 50% in some cases.
Please look for "bloqueador de ar". I did not find nothing like in english language.
Hope it helps, and good look! Paulo