The Grit Gitter is the underwater vacuum operated and powered by you. This is a great remedy for sand and silt at the bottom of your pool or spa. Its as simple as placing the Grit Gitter over the debris, squeezing the bulb on the end, and sucking it up! This is completely independent of your pool/hot tub so there is nothing to hook up to, plug into, or haul out of storage. Ease of use is the name of the game.