I performed a little survey at work and out of 23 other pool owners, I am the only one having to add acid on a constant basis. Coincidentally, I am the only one using liquid chlorine (Walmart brand). TA has been religously kept at 60. As for the users whose ph is being lowered, I don't understand the comment. As far as TDS, I had a level of 30,000 and had to have an RO treatment. This was following 2 yrs of liquid chlorine use. Both my TDS tester and the RO companies tested the same. The first thing they asked was if I was using liquid chlorine! My pool is being refinished this week and I am just trying to make the right choices going forward.