Quote Originally Posted by Mindiv View Post
It is amazing to me how many people don't know that high CYA levels require higher FC levels.... Any references? I tried a search with no luck.
Not that amazing to us.

I published the first material to that effect, based on my experiences and John Wojotowicz's articles in the JSPSI. Richard "ChemGeek" dug into the chemistry of it, and provided the rigorous analytical foundation for understanding the issue, based on his analysis and the O'brien article (on which Wojotowicz had depended).

About a decade after I first published the first version of the "Best Guess" chart, 10,000's of users here and at TFP have established repeated field validation of that analysis.

But, even now, only my sites (PoolForum and PoolSolutions) and TFP consistently acknowledge these facts. To my knowledge no one 'officially' in the pool industry has done so.

The same is true of the 'step-by-step' approach to alkalinity control that I originated -- even though that approach is well-established in both the potable and waste water treatment industries (though I only discovered that after the fact), only PF/PS and TFP teach this approach.

Truth, when it steps on established practices and profits, is never popular. This is just as true among evangelicals as it is among atheists; among Democrats as it is among Republicans; among industrialists as it is among environmentalists. A friend of mine once observed that trying to serve the truth is like trying to wield a sword equally sharp at the handle, as the end: no one is safe around it.