See first-hand how water and air act during a pressure test in this demonstration using clear PVC plumbing. The demonstration illustrates three key pressure testing principles that direct the best practices for pressure testing and pinpointing leaks in swimming pool plumbing.
1. Air compresses under pressure, water does not.
2. Water stays at the bottom of a plumbing line, air stays high.
3. Air escapes from a leak faster than water does.
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