During installation of copper pipes, what must be done instead of using the improper flux?

Using the proper flux is essential in the installation of copper pipes as it helps to promote the flow of solder and form a strong joint. If an improper flux is being used, the best course of action is to clean the pipe. Cleaning the pipe involves removing any oxidation or contaminants that could interfere with the soldering process. This ensures that the surface is smooth and conductive, allowing the solder to make a proper bond when heated.

Cleaning the pipe not only prepares the metal surfaces for soldering but also prevents potential issues such as weak joints or future leaks. Proper maintenance of the metal surfaces guarantees that the solder adheres well, leading to a durable and reliable plumbing installation.

While the other options may have their own relevance during various aspects of the plumbing process, they do not address the immediate requirement of ensuring a clean surface for the soldering operation, making cleanliness on the pipe the prioritized action when confronted with improper flux.