I had a plumber doing some work for me that did not sand the inside of fitting or the outside of pipe ends (on new pipe) that were to be soldered. He said it was a waste of time as flux takes care of it. He did ream everything and did sand existing pipes in ground that were badly corroded. I had always seen everyone sand. Is it a waste of time. I do some of my own soldering and wonder if this extra step has been a waste of time. What is everyone here’s opinion? I don’t want to pull it apart now. It is already done.
there is flux on the market that will clean the pipe and fittings. Use steel wool it is better. I always clean, but sometimes with the right flux it is not nessessary. It is a good habit to clean in my opinion.better safe than sorry.