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Skimmers suck water into the filtration system for cleaning. Most spas have a skimmer located near the spa controls, with a basket that traps large material. To maintain the skimmers you simply clean out the basket periodically. Some spas, however, contain two skimmers, one at the top and one in the footwell of the spa. This adds another dimension to the filtering process. If you've ever owned a spa, you know that sand, dirt, and a host of particles can fall to the bottom, and the only way to get them out is to vacuum them. This two-level skimming system solves that problem and helps keep the spa cleaner longer.