Service technicians will often spend countless hours leak checking refrigeration or air conditioning systems and not find the leak. When a refrigeration system has lost most of its refrigerant charge in a short period of time, the leak is probably significant and should be easy to find.
Today’s sensitive electronic leak-detection systems can pick up a leak of less than one ounce per year. Even bubble solutions are getting so chemically sophisticated that even the smallest leaks will show up as small white “cocoons” of bubbles or foam.