1.   It does not pick up flaws in a pipe until a leak actually develops, and leaks can go from small to big very quickly.

2.   Since the stains are caused by moisture, getting rid of the moisture indoors by ventilating and fixing leaks outdoors will go a long way toward a solution.

3.   These leaks sometimes go unnoticed if the pipes are enclosed in a vanity or cabinet.

4.   They also learned quickly that a roof leak may go undetected for weeks if the family does not frequent certain rooms.

5.   A leak could go undetected for all of those months, the actress said.