While I have perused the forum and have seen some reference to the fact that CYA level needs to be 60 to 80 with a SWG, I guess I can't convince myself of its use. I have an outdoor pool with a swg/ozone system called a claripure. This system is patented on the basis that the synergies of ozone and chlorine together outweigh the swg alone. They also claim novel chemistry in the cell whereas chlorite and chlorates are also formed which have superior properties killing some organisms. I have a link to the patent somewhere if that would be of interest.
That said, my pool looks great and after two plus years the only thing I have ever added to the pool (aside from some spilt beer ) is acid, about 1.5 cups per day to maintain pH. I have almost no detectable CYA in the water and my generator is set on 50%. I run the pool pump 10 hours per day and the water temp is just over 90 degF. FC is 4, pH is 7.6, TA is 60 and CH is 550. My CH has stayed on the high side but our makeup water in florida has lots of Ca.
Anyways, the local pool store, along with my manual, suggest I add a bunch of CYA. With such clear water, as the saying goes, if it's not broke, don't fix it. No knock against pool store folks, but the ones at my local store just say add it because that's the guidelines, but they don't have the chemistry to back it up.
After reading posts regarding the unnecessary sale of pool chemicals I'm not sure if I'm being hard headed and should just go with the flow. That said, I have also been told I need a metal sequestrant because I have a SWG due to iron and copper though their testing shows the levels are 0 ppm