I've found that the finger points both ways - pool stores say that web sites like this take a one-size approach, meaning that they ignore geographical and weather differences. I'm not taking sides, just making a relevant point.
The way I see it, it is irrelevant who says what.
The results speak for themselves. And it's quite clear from the thousands of members here, from not only US but around the world, that the TFP methods simply work.
And I have yet to see a one size fits all responses here, well maybe with the exception of getting a good test kit, standardized signature and posting test numbers.
Can you give specifics the one size fits all approach on here, or are you just saying what some pools store employee told you?
Even the geographical and weather argument makes no sense, since the CYA level is not a fixed number, but a range. And with this range the FC levels also have a range and are not fixed.
Yet, the pool store methods, while accept a wide range for CYA levels, only recommend FC of 2-3ppm, no matter the location, batherload etc.
So, what specifically do they cater to location and weather differences?