i hope this has relivency. bens best guess chart shows the cya/stabilizer numbers and the respective clorine levels that should be maintained accourdind to the stabilizer. your cya is at 90 which shows that your min. fc should be 5, and max. should be 10. I hope this is my correct understanding can someone please verify.
here is the link for bens chart
http://www.poolforum.com/pf2/showthread.php?t=365
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
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