I am new to this forum, but certainly not new to pool care. I have to say I have never seen so much attention to maintaining different Cl levels based upon one's CYA level. I am not really sure what I am missing, but these charts seem outrageous to me. I mean there are areas of the chart that mention 40, 50, 60!!! ppm shock levels. I've never heard of such a thing. I have never had a severe algae bloom. "IF" I see the first sign of algae, I throw 3 bags of Calcium Hypo into my 38k gallon pool and I am good.
Most test kits don't test north of 5.0 for your Cl level. When I shock I am slightly above that. So maybe a 7.0, maybe even 8.0 to give the benefit of the doubt.
As far as CYA levels.... If the purpose of CYA is to "hold" the free Cl from loss from the sun, why do I need to maintain a higher level Cl if I am reading say 70 as opposed to 40 on my CYA? The reason I want CYA in the first place is so I don't lose my FC. Now this forum is telling me to add more Chlorine the higher my CYA is.
Does this seem backward to anyone else?
And again this is coming from someone who has rarely had problems with my pool. And when I do, they are minor and simple to correct.