I think I have a water leak in my basement. What are some ways to detect and repair the leak?
Have a shop perform a leak test with a halogen detector.
detect nytrogen
Pressure test system and watch for leak
What are the most chemical methods to detect bacteria on hands?
Leak detection dye can be purchased at any number of pool repair/maintenance companies/websites; it can also be found on eBay. There is no powder you can put into a swimming pool to detect a leak.
detect smell
While this may sound difficult, you can save money if you can locate the leak for the plumber.
Helium is used to detect leaks.
Dye testing
Ultrasonic leak detectors, are also referred to as acoustic gas leak detection systems. They are designed to detect gas leakage at outside facilities.
Sniff test