Independently NSF (National Sanitation Foundation) tested and proven, genuine Hayward TurboCells have been reliably delivering chlorine to pools and spas for nearly two decades. Producing soft, silky water, that wont turn eyes red. With savings of 50% or more over conventional chlorine costs, its not only the #1 salt chlorination cell in the world, its the best value. Other replacement cells offer significantly less life and less chlorine. To get the most of salt chlorination, at the best possible price, use only the original Hayward TurboCell.