Looking at your location, I would suggest that you bump the CYA up to 40 like Watermom suggested, and then give it a week or so of testing morning and evening to see if your chlorine loss slows down. If not, you might want to consider bumping it up to 50 or 60. That is high for most pools, but I'm up around Shreveport, and I lose a lot less chlorine on a daily basis by keeping my CYA at 80-90. That's pretty high, though, so I would recommend bumping it up a little bit at a time and see if you get less chlorine loss. When you get to a point where you're losing 1-2 ppm a day, then that's about the best you can hope for!!

Janet