Quote Originally Posted by fcfrey View Post
My chlorine consumption in Central PA has been running about 70 oz (6%) per day. I have maintained a FC level of 4.2 ppm for about a week by injecting the chlorine mix directly into the return line using a peristaltic pump. The injection pump runs whenever the pool circulating pump runs which I currently have set to run 7 hours (10AM to 5PM)

My CYA is 25.
Water temp is ~70
I am not using a solar cover yet because of the birds. (that's another story)
My night time CL consumption is nearly zero so.......

Basically the system works like an erosion feeder but I don't use pucks and no CYA increase. This is an experiment which (knock on wood) seems to be working.
I also am in PA (Philadelphia area) and use a solar cover on cold days-no sun days. Water temp around 80-85 deg (solar and heater). I lose 0.7ppm Chlorine per day with no solar cover (off during the day and on at night) and 0.2ppm per day with a solar cover on during the day. These figures good for 2 wks now during the month of May for my 30,000 gal concrete pool. My CYA is 35ppm and I maintain Cl at the 1-2 ppm level using Chlorox 6%(I also use a Nature 2 system which allows me a lower Cl and no algae problems).