What is the recommended way to test a scuba cylinder for potential leaks before use?

Using a soapy solution to test for leaks is the recommended method because it allows for the identification of small leaks that may not be visible through visual inspections or other methods. When a soapy solution is applied to the areas of concern, such as the valves and fittings, any escaping air will create bubbles, clearly indicating the presence of a leak. This method is effective due to its simplicity and reliability; even minute leaks can produce noticeable bubbles, ensuring that divers can safely assess the integrity of their equipment before use.

While visual inspection and checking air pressure are important steps in general maintenance, they may not reveal subtle leaks. Submerging the entire tank underwater is also an option sometimes used, but it can be less practical and may require more equipment to adequately evaluate potential leaks. Therefore, utilizing a soapy solution for leak detection stands out as a direct and effective method.