VACUUM WITH THE FILTER ON FILTER OR DRAIN
If there is only some thick film at the bottom, you can vacuum with the filter at "WASTE" or "DRAIN" to bypass the sand.
Once you have removed the leaves with a net, you can vacuum with the filter on "DRAIN" or "WASTE", quickly, as the water level will go down fast. Keep an eye on the skimmer. Put the garden hose in the skimmer to avoid a lack of water to the pump
Empty the skimmer and pump baskets often.
If the water is clear and there is only a bit of dirt or algae at the bottom, the filter should be at filter.