I was wondering if there is any "general guidelines" as to how much FC loss to expect on a daily basis.
Hypothetical: if water temp is in the mid 80's and weather is in the 90's with full sun from 8:30am till 5:00pm.
Is there any rough formula for expected FC loss? I think I read somewhere that it could be as much as 50-65% of FC. For example, if FC is 4 then FC loss on a sunny day as described above would be about 65% or 2.6ppm.
I want to know because I just completed a SLAM and the rate of FC loss seems more at the beginning (when FC=20ppm) and gradually gets smaller. My SWG has been set to 65% throughout the process. I want to make sure that once FC reaches about 4ppm (CYA is about 70), that I can keep it there with the SWG.
So, if I can assume a 65% FC loss on a sunny day, then my SWG (dialed to 65%) needs to produce 8.3oz of chlorine gas to generate the lost 2.6ppm (of course, this assume no OCLT loss). But since I usually get an OCLT of 0.5 to 1.0 then I really need to generate 3.1ppm - 3.6ppm (or at least 10oz - 11oz of chlorine gas)
So, if I run my SWG for 12 hours at 65%, i can generate 11 oz of chlorine gas and i should be all set.
Looking for any holes in my thinking, especially around my assumptions for FC loss.