For those of you using Bleach...

[vanhout]

The answer to your question is a function of both CYA and FC (total free chlorine) levels since twice the chlorine level loses about twice the amount of chlorine per day. I now have around 15 CYA and 2-3 ppm FC and lose about 0.5 ppm per day. The pool is normally covered and is open to sunlight (it's an outdoor pool) about 14 hours per week. I used to have more CYA, but had more chlorine and the rate of loss was about the same.

Is that really true? If I keep my FC higher I lose more per day?

Example: If I normally maintained FC level at 4 ppm, and use 2 ppm per day, then I'd use 4 ppm per day if I tried to maintain at 8 ppm?

Anecdotally, I think you're right, it seems like I do lose my Cl faster at higher levels - like when you shock.