So last Sunday the pool store said my CYA was 60. Friday I tested again I got around 55. The following day Saturday I took it to the pool store and they said it was 40. Previous tests at the pool store have also differed one was 30 then 50 then 40. I will test it again myself and post my results. I thought my CYA would not change that much once in the pool. I am using tablets but thought those would only raise CYA not cause it to fluctuate. I know splash out can affect CYA what about bather load?