For a number of years the SWCG folks, both pros and owners, have been aware that the "Best Guess Table" overstates THEIR required chlorine levels for the higher CYA levels required.

Normal CYA levels for them of 70 or 80ppm with FC levels of roughly 2-4 seem to easily keep their pools sanitary because the FC level is far more constant than in a manual pool.

But Ben's point of laying out practical, simple, and understandable steps to recommend is the equally valuable flip side of taking pool maintenance from alchemy to chemistry (the struggle we are all engaged in).

After all, most of us users aren't going to understand or care about molecular interactions by which bleach, which is not pH neutral, creates a reaction by the release of chlorine in exactly the opposite direction that zeroes it out. We WILL understand the bleach doesn't alter pH.

We want and need to advance the art and science of pool care, but to be useful we need to turn this into both practical steps and a clear decisive decision tree to follow to get to the ultimate goal:

A safe, sanitary swimming pool that's easy to maintain and is available for swimmers as much as possible.

That's why the China Shop is a great place, actually THE place to discuss theory, new concepts and experiments.