I have had my pool 13 years, the first liner lasted 11 years and we installed a new one 2 years ago. The first 11 years I used pucks from Walmart and I guess they just had smaller amounts of stabilizer in. My cya stayed a little high but never over 80. (Maybe all day direct sunlight helped this?)The last 2 years I have been using 3" tabs from online pool stores and my cya climbed into the 150 range. So after being disappointed I now have the pool drained 60% and filled back up. I should be firing up the pump in an hour or so and getting some samples. I will be using liquid bleach/chlorine from here on out and only using tabs when stabilizer is needed or when I go away for several days(until they're gone, which will be awhile). How often do you guys add bleach? Everyday? Every other day? I guess my first thing to do is determine how much the pool uses a day. So now I am on to a new learning experience. Up until the last week or so all of my water tests have been great and in limits since I check every other day.