Pentair AquaTech is a diatomaceous earth (D.E.) filter designed to filter water in swimming pools and spas. It is a pressure-operated filter that provides clean, bright water by removing dirt and other particles. The filter has a tank, a valve, and a grid assembly. The tank is made of durable plastic and is designed to withstand high pressure. The valve is a multiport valve that allows the user to select different filtration modes, including filter, backwash, and rinse. The grid assembly is made up of a series of grids that trap dirt and other particles.