My in ground gunite pool is 10 years old. I've always been able to manage water balance using trichlor tablets, bleach, acid, and washing soda, most of which I learned here long ago. This summer, I've not been able to keep the pH levels above 7. I've used so much washing soda in the past few months that the people at the grocery store are starting to look at me strange. Alkalinity is 120-180 usually. Cya is on the high side 100-150. Hardness is about 100. Our neighborhood switched to chloramine treated water last fall, and I'm beginning to wonder if that's contributing to the problem. It's also been extremely hot, > 90 for weeks, but that's not unusual in Texas. I thought about partial draining and refilling, but only want to do that if absolutely necessary, since we're in a drought and the water bill from just maintaining the water level is almost as high as my electric bill. Any suggestions?