So from what I've been reading, my initial understanding is that getting the CYA up is important because it protects FC from sunlight. I interpreted that to mean that the higher the CYA (without going too high of course) the less I will have to run my SWG because the FC won't be getting 'burned off' by the sunlight. But then I read in pool school : "The higher your CYA level, the more FC you need to use to get the same effect." So THAT makes it sound like I will have to run my SWG more once I get my CYA level up to their appropriate level. What am I not understanding here? WHy would I want to increase my CYA if it means that I am going to have to run my SWG more?