I would suggest you check out AutoPilot Digital units. I love my system and have had trouble free and almost maintenance free operation for 3 seasons now. Once you install and "dial it in" for your pool, it automatically adjust chlorine generation based on water temperature. All I have added throughout the swimming season is a little muriatic acid to drop the PH as it creeps up (side effect of SWCG systems). People are amazed how easy it is for me to maintain my pool.