I may be wrong; I'm still fairly new, but someone on another thread stated that Leslie'a recently bought Pool Supply World. Until a week ago I hadn't heard of either company, but I did find some Youtube videos from the latter that looked like they could have been produced by TFP. They even show the FC/CYA chart and pool math giving credit to TFP. But on the other hand, they've also got videos promoting trichlor (w/o warnings that it will raise CYA), and other products that TFP folks would never recommend.
I think it's possible to present and teach more than one method; even if only one of them truly works, and maybe that's the only way the industry can move away from this sham that has gone on for so long w/o getting blackballed be the chemical companies.
That's what I'd like to see at the pool stores: option one--TFP; they'll have the test kits; liquid chlorine; the fc/cya charts, borax, baking soda, acid,recommended levels, SLAM procedures, information about how to achieve and hold a good CYA level,and troublefreepool.com given out for guidance. Option 2--FC 1 to 4 and all the junk that's supposed to keep these under sanitized pools clear.
My local pool store has an aisle of stabilized chlorine and an aisle of cal-hypo products. They actually tell people to stop using the stabilized chlorine when the report prints out to drain the pool due to CYA too high and to remember to buy from the unstabilized aisle. I can't remember what point that is and if they make adjustments for SWGs, but I do remember, before I found TFP, that I had CYA 68; the report said do a partial drain, and the associate told me I didn't have to drain; just don't use stabilized chlorine. He recommended cal-hypo pucks sold only in a huge bucket for daily maintenance. I didn't buy it, because I've got only a 7500 gallon pool, but hat information is what got me interested. I didn't understand this CYA thing and why that made a difference.
My point is that not all the stores are oblivious to CYA levels until the customer reaches 100, but I can't understand how the stores can acknowledge that CYA can be too high for chlorine to be effective, but can't acknowledge that a higher FC is needed @ 45 than is needed @ 30; and ditto for shock levels. And then there is the third major issue of testing; and the fourth major issue of Shock (which is blind hope) versus SLAM, which is guaranteed destruction of organic matter. It would be interesting to see how Leslie's would respond to these concepts.