1st. Open any source of water. Example, tap.
2nd. Let the water run. Let it escape.
3rd. When you think you are done, close the tap.
Reason: If you don't let it run, the water will be trap there until the next time you open the tap. Think about the water that wants to flow freely. The water is trapped there in the tap. Dark... Cold.....
It cost money for this but, YOU, CAN MAKE A DIFFERENCE.