What setting to have pool when vaccumming?

When vacuuming a pool, it's best to set the filter to "Filter" mode if your system has that option. This allows the vacuum to draw water through the filter, capturing debris effectively. If you're using a suction-side vacuum, ensure the skimmer is set to allow for vacuuming, and close any other skimmers or returns to maximize suction. Avoid using the "Waste" setting, as this will drain water from the pool.