If your pool is indoors, this is correct.
If it is outdoors and you want to buy a replacement cell in 2 - 3 years, this is correct.
If outdoors and you want to get a 'typical' life out of your cell, then TFP recommends CYA of 60-90. You run an
appropriate amount of FC for your CYA level and that is achieved by programming the SWG output % and pump run time after you've gotten a feel for the system.