Chlorine/CYA and Combined Chlorine

[Water_man]

Alright, guys, you made it clearer and clearer, however one sentence by chem geek threw a monkey wrench into my newly acquired pool chem understanding.

Chem geek is saying:

Nevertheless, when there is CYA in the water, the 10x rule isn't bad as it does take a while to get rid of the non-ammonia-based (i.e. not monochloramine) CC so having a higher chlorine level can make that go faster, but sometimes the CC is persistent and no amount of chlorine will get rid of it.

Well, in most cases there is CYA in the water, isn’t there? So after challenging the validity of the 10x rule persistently, are you saying that it isn’t bad? Is this a typo? Please explain.

From both of your posts, chem geek and Waterbear, I understand better when I need to shock
an algae-free pool. I am still at odds at the amount of FC needed.
Ben’s table for my 60 ppm CYA reads 20 ppm FC. Chem geek’s number is 23.7. If the previous chem geek’s statement of the 10x rule is true, isn’t the 20 ppm FC an overkill?
So how much do I really need?
Suppose I do shock at 20 ppm at night, would it be safe to swim in the following morning?

I really appreciate the time, effort and knowledge that you guys invest in this forum,
which leads me to the following suggestion. I hope you won’t be offended and that this would not be a violation of the forum rules, and if either of the above is affirmative, I offer my apologies in advance.

I don’t think that it’s fair that pros like you (and others pros in this forum) offer their hard earned professional expertise and time for free. This is your career, not just a hobby. I suggest that you put together a detailed and comprehensive manual dealing with all the theoretical and practical issues of pool chem and maintenance routines which you scattered all over this forum and elsewhere and offer it for sale. This would be a great service for the pool owners community and a fair compensation for your dedicated service to this community.
Again, please accept my apologies if this was inappropriate.