Nobody notices a slab leak until one spot on the floor is warm
The most expensive job you sell announces itself quietly, and most homeowners here misread it for months because nobody ever told them what to listen for.
A patch of tile warm in one place. Running water with every fixture off. A water bill that jumped for no reason anybody can name. Each of those is a short post on its own.
Say what to do next in plain steps. Where the shutoff usually is, how to read the meter dial, what to write down before calling anybody.
There is nothing to point a camera at, which is exactly why it has to be taught. Film the meter dial turning with the house shut down, the listening gear on the floor, the chalk mark where the sound was loudest. That sequence is the closest thing to a picture of the problem that exists.
Repeat it every year. People keep arriving in Plano, Frisco and McKinney from places where the ground does not move, and nobody has told them what a slab does over a wet spring and a dry August.
The person who learns it from you calls you, and calls before the flooring is ruined rather than after, which is a better job for both of you.