So I've been wondering just how much FC is produced by a typical SWG. I was able to find out that one of the SWGs we typically use produces 36 grams/hr. So if I convert that to ounces, I get about 1.3oz. If I plug this into the pool calculator, it says it equates to about 0.4 ppm FC. All of this is based on a 24,000 gallon pool (what I would consider "average" size) with CYA between 50 and 80 ppm. I'm assuming that 36 grams/hr is the maximum output. This seems kind of low. If a pool runs 12 hours/day, it would only generate 4.8 ppm FC in a day. Most of my pools run at 50% or less. So that would mean only 2.4 ppm FC is added in a day. So in order for these pools to maintain FC levels, they must only be losing 2.4 ppm or less.
Is my math wrong, or do pools really only lose about 2 ppm FC in a day?