Pentair 520555 IntelliChlor IC40 Salt Chlorine Generator Cell - Do not buy this product. Mine quit working after 1 summer this year, my old one lasted 6 years. I bought it March 25,2017 and it quit working about 3 weeks ago. $709.30 down the drain. This company won't do anything about it. Don't buy from them. This won't be my last product review on this vendor. I am very disappointed!