Hi, and welcome to the forum!

In Texas, with the heat we've been having (I'm near Shreveport, LA, similar climate and maybe not even as hot as it is where you are), you'll find that the chlorine will stay in your pool a lot longer if you'll raise your CYA. We normally recommend around 40 ppm in most folk's pools, but in our climate I find that I still use too much chlorine. I personally run my CYa at 80-90 ppm, but that's much higher than most people around here. That does, however, allow me to maintain a Cl level of 8 ppm in my approx. 29K gallon pool using only 4-5 of the 1.4 gallon jugs of bleach weekly.

You're on the right track, a CYA of 50 ppm is a good place to start. See how well you're able to maintain a chlorine level with that, and you can adjust from there. One thing, though--in order to determine whether the water has something in it that is creating chlorine demand, or whether it's all just from the sun, try testing your chlorine at night and then again the next morning before the sun hits the pool. If you've lost more than 1 ppm of chlorine in that time, then there's something other than the sun eating it up, and you need to shock the pool.

Janet