Water
-
Fresh going down, gray coming up
A tank that will be a problem on Thursday is already saying so on Tuesday. How to read fresh, gray and black, and why the two directions together catch a leak that neither number catches alone.
-
The pump runs, and nobody is using water
A demand pump only runs when pressure falls, so with every tap shut it is either a leak or a passing check valve. One is a floor to replace and one is a job for next month, and one extra reading tells you which.