We bought our house in March this year (2015) and this is our first pool. As an overachiever I want to know EVERYTHING about pool maintenance. I've been saddened by the lack of knowledge at pool companies but...We are getting ready to convert to SWG. I've been struggling with over-chlorination alternating with profound under-chlorination because the dial on the tab tower doesn't work. As a result of the frequent imbalance the plaster is in sad shape, it was very pitted when we bought. Resurfacing will happen next spring. Our pool is approximately 44k gallons. I was just told that my "CA" levels are too low and all I can assume he was referring to is CYA levels. Though he recommended keeping it at ~100 which seems high? The tech also said the my low "CA" might be from a leak? I've passed a multi day bucket test. Sometimes it feels like getting the truth about pool chemistry is well nigh impossible. Any suggestions welcomed.