I have an Jandy Aquapure Purelink AP1400 SWG and have a question relating to the target FC levels. The Chlorine/CYA chart in Pool School shows the target FC levels of 4, 5 & 6 for CYA levels of 60, 70 & 80, respectively. The manual for the Purelink SWG recommends the CYA range to be 50-75 PPM and the FC range to be 1-3 PPM. There is a warning note which says that above 3 PPM of FC may cause corrosion of pool metals. The manual also states that the Aquapure is warranted to operate properly only if these conditions are met.
Assuming I keep my CYA at 60 PPM and the Pool School recommended FC level of 4 PPM, it appears that I am voiding the warranty on the SWG. Also, when I need to shock the pool using the Pool School recommended levels, could this damage the SWG? I would appreciate any thoughts or comments on this.