I buy big rolls of copper mesh from a fairly popular website. They come in different lengths and are about 6″ wide. This way, you can make a roll that fits the diameter of your column, 2″, 1.5″, etc. Always pull them out and rinse them off at the very least when done with a run. As mentioned prior, a good soak in white vinegar is best. make sure and rinse off the vinegar, too.
I also use them until they fall apart, copper ain’t cheap.