I've had a major problem raising pH above 7 for the past year. My pool store says to add soda ash, but no matter how much soda ash i put in, the pH hardly rises at all. Last year i added almost 50 lbs over the course of 2 weeks, and the pH hardly changed! Haven't seen a pH above 7.2 in a year.
i'm using either dichlor granules or trichlor tablets on a daily basis to keep the FC at about 5 ppm. There's no combined chlorine. The Calcium is 105 and the alkalinity is 110. The CYA is 100. pH is 6.7. The water is clear.
Any ideas would be greatly appreciated!