Normal "burn" rate for chlorine in a day

[fcfrey]

So, 70 ounces of 6% bleach in 27,038 gallons is 1.25 ppm FC per day which with a level of 4.2 ppm FC is a loss of about 30% of the FC level per day. That's pretty good, especially with a CYA of 25 and no cover. The cooler water temp of 70F might be helping there. Keep us posted as it (hopefully) gets warmer for you in the summer. Not having any loss at night indicates that your chlorine loss is probably almost all due to breakdown from sunlight (and maybe a small amount with outgassing of hypochlorous acid).

Richard

Richard,
You never fail to amaze us with your knowledge.

I was trying to work the numbers to come up with your result and have not had any luck. Are your calculations in one of your posts in the China Shop?? Or could you run the numbers so I can see how you got there?