I finally broke down last week and bought a test kit that allows you to test chlorine levels above 5ppm. After being told by the pool store guys for over a year that my CYA was 100 ("That's as high as we can test for but it's ok since you live in Florida" or my favorite "Take the pucks out for a week and the CYA will evaporate") and that my FC was 5ppm ("too high," odd given aforementioned CYA level), I'm now able to accurately see what is really going on in my pool.
My CYA is 60, and it turns out I've been maintaining a FC level somewhere between 12-15ppm from all the weekly shocking.
Thanks to this site I've been able to ditch the pucks, and my water looks and feels a hundred times better.
Is there a rule of thumb for how much chlorine a pool should use on a daily basis? Depending on which CYA/Chlorine chart I use, given a CYA of 60, minimum FC is 4.5-5.0ppm and target FC is 8ppm. I usually raise it up to about 8.5 at night, measure it at 7.0-7.5 the next morning and it's back uncomfortably close to 4.0-5.0 by evening.
Is this a pretty typical consumption rate? The pool is used every day and gets about 6 hrs of direct Florida sun.
Most recent measurements...