First of all, your chlorine level is much too low (you said it was .5 at night, then you added chlorine, and then 1 the next morning). Refer to Ben's Best Guess CYA Chart to see that at 40-50 ppm CYA you should have a minimum of 3 ppm of chlorine at your lowest point which is just before you add chemicals if you are only going to add once per day. With full sun (you said 24/7, but you're not north of the artic circle so I'll assume you didn't really mean that) you will lose perhaps half of your chlorine so you'll probably have to add chlorine to get to 6 ppm though you'll have to check this and just make sure you don't go below 3 ppm.

The suggestion to use BleachCalc is the way to go. You are probably adding way too little chlorine.

Richard