AutoPilot 15-Blade Replacement Cell is a replacement part for the old CC15-MF model. The cell’s 15 blades provide highly potent chlorine generation (2.5 pounds per day), yet are easy to clean as needed with a solution of water and muriatic acid. Its longevity is also enhanced by the unique manifold design of Pool Pilot systems, which includes a strainer to keep debris out of the cell and a tri-sensor to determine if water flow, salt levels and water temperature are sufficient for chlorine generation.