On page 10 of the installation brochure for Pentair's IC40, it references the optimum pool chemistry for salt water pools and the reference to free chlorine caught my attention, It states, "Free Chlorine: 2.0 - 4.0 ppm. Above 4.0 ppm may cause corrosion of metal components".
I currently have the Stenner with a CYA of 50 and according to TFP my minimum should be 4.00ppm and my target is 6.0ppm. I regularly keep my FC at 6.0pm and my water looks great. However, it has only been 7 months. Am I causing corrosion to metal components as the Pentair manual states? I most concerned about my pool heater but I believe the heat exchanger is stainless steel so maybe this is not an issue.