I have two different questions I'm hoping someone can shed light on for me. First is regarding using aeration to raise pH:
Is it true that aeration only raises pH up to about 7.5, then has little effect after that? I remember reading that in a post here. If that is true, why do SWG's raise pH up much higher than 7.5? Isn't it supposedly aeration from hydrogen gas produced during the process of chlorine production that causes the pH rise?
Second question:
I also remember reading that after CYA is raised to 50ppm, there is really not much benefit as far as protection from UV degradation. If that is the case then why is it recommended to keep CYA higher with a SWG? Is there another reason other than the UV protection? Is it for CSI? Or am I just wrong and there is much more benefit being higher than 50ppm?
Is it true that aeration only raises pH up to about 7.5, then has little effect after that? I remember reading that in a post here. If that is true, why do SWG's raise pH up much higher than 7.5? Isn't it supposedly aeration from hydrogen gas produced during the process of chlorine production that causes the pH rise?
Second question:
I also remember reading that after CYA is raised to 50ppm, there is really not much benefit as far as protection from UV degradation. If that is the case then why is it recommended to keep CYA higher with a SWG? Is there another reason other than the UV protection? Is it for CSI? Or am I just wrong and there is much more benefit being higher than 50ppm?