Why RetroChlor? Self-cleaning cell Part of the reason chlorinators become faulty is due to a build-up of calcium on the cell plates. RetroChlor eliminates this problem with 'reverse polarity technology' which changes the direction of the current at programmed intervals, dissolving calcium off the plates. Safety in mind Safety of your unit is paramount and with 'over current' and 'temperature control' incorporated, safety and reliability is ensured in our extreme heat and the harsh operating conditions. Chlorinator control box Electrolytic cell Chlorinator output cable ATTENTION! This unit ONLY works with an existing Zodiac Ei series cell housing.