The main purpose of a swimming pool skimmer is to remove debris from the surface of a pool. It does this by a flow of water that’s being sucked in to the inlet from the pump’s suction. Skimmers are located on the side of pools and you’ll notice them as there will be an inlet within the tile line beneath the pool decking. Inside the skimmer there is a weir door it’s normally a small plastic rectangle that moves back and forth. When the pump is on and water is flowing into the skimmer the weir door will be down and when the pump goes off and the flow stops the weir door will float back up and close preventing the debris within the skimmer basket from going back out into the pool. Also, within the skimmer there will be a basket to catch the debris this should get emptied at least weekly.
Some pools may have several skimmers they will all have lids on them most commonly round plastic ones. You can use the skimmer to manually vacuum from if the pool doesn’t have a dedicated vacuum port. You can regulate the suction to the skimmer via a valve at the pool equipment have the skimmer on full suction if you are vacuuming from it.
If you need pool service in the Las Vegas and Henderson areas PoolStar would be happy to help.