Replacement Cell for the Ace salter water system. Ace Cell is for the following models. The item “Watkins Ace Cell” is in sale since Saturday, February 25, 2017. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs”. The seller is “hottubspasupply” and is located in Yonkers, New York. This item can be shipped to United States.