Stabilizer . . . . . . Min. FC . . . . Max FC . . . 'Shock' FC
=> 0 ppm . . . . . . . 1 ppm . . . . . 3 ppm . . . . 10 ppm
=> 10 - 20 ppm . . . . 2 ppm . . . . . 5 ppm . . . . 12 ppm
=> 30 - 50 ppm . . . . 3 ppm . . . . . 6 ppm . . . . 15 ppm
=> 60 - 90 ppm . . . . 5 ppm . . . . . 10 ppm . . .. 20 ppm
=> 100 - 200 ppm . . . 8 ppm . . . . . 15 ppm . . .. 25 ppm
According to the pool store computer (Bioguard) the 'ideal' level for CYA is 30-200ppm and for Chlorine is 1-3ppm. But according to the best guess chart, anything above 30ppm CYA is not sanitized if chlorine stays at 1-3ppm? If so, how come there aren't a lot of people getting sick in their pools? Wouldn't there be lawsuits galore?

Where did these 'best guess' numbers come from, and how come they are so far off from 'the industry' standards?

Inquiring minds want to know...