Most skimmers on in-ground pools are built into its upper sides, where the suction draws debris and traps it. Most pool skimmers are accessed via the pool deck area through a trap door or hatch. The skimmer is also in a convenient location to attach a suction line for a pool vacuum.
Because above-ground pools have thin walls, floating pool skimmers are most often used, as are units that hang on the pool's edge. To keep skimmers for above- and in-ground pools working properly, try to clean out the skimmer basket daily during swim season.