The pool is a vinyl pool and I use a Taylor K-2006C test kit for checking everything. Is there any alternatives to bleach that does not drive the TA and CYA up. My Calcium hardness should drop at some point. Any added water from my well has almost a 0 in calcium hardness (it dropped last year and the "pool store" got me to increase it (wish I had read this site beforehand), they also got me to increase my TA (wish I had read this site beforehand).....got to love Pool Stores!