OK, so here are my numbers today. We got a good rain 2 nights ago, adding about 3" water to the pool.
I've been using 3" tablets. FC never gets above 1. Using Borax for pH. Last night around 730, I added a gallon of bleach, bringing FC to 4.8. This morning at 630, FC was down to 2.4. I've checked CYA about 6 times over the last month, and it's always been between 35 and 50. What would cause it to jump so much?
I was going to start slamming it, but was waiting for the Taylor fas-dpd reagent to get here so I could get a good reading. It arrived yesterday. Where do I start?