Using dish soap provides an effective method to check for water leaks. When plumbers install a pipe, they often mix liquid dish soap to create a bubbly foam. When the pipes are sealed, the soap is applied to the new joints. Water leaks from a pipe at a high pressure, which would form bubbles and cause the soap to splatter. These soap bubbles identify the location of the leaks in the piping.
A pressure gauge is used to check new water-supply line installations. The body of a pressure gauge is the size of a palm disc. A threaded connector protrudes from the body's circumference. On the end of the body is a dial that indicates the amount of pressure measured in pounds per square inch. The gauge is attached to the open plumbing fixture. This is done when the water is shut off and the system is dry. The system is then turned on to fill with water and the dial monitors the amount of pressure. The pressure gauge is left on for a long time, usually overnight. If the pressure measurement is unusually low, this indicates the pipe is leaking.
UV Dye and Detection Light
Ultraviolet dyes are bright, fluorescent paints that can be seen with the use of UV detection light. These dyes are used on the pipe line when the system is off. After running the water for a short time, the detection line is shone on the dye to find any cracks in the piping. Seeping or leaking makes the UV dye appear bright to help detect the location of the leak. This equipment is very effective and inexpensive.