Thanks everyone! I just took the final reading of the night... For the previous reading, I had gotten 15.5, so I added 2c of bleach. This reading (an hour later) was 17... ?!? Not sure what happened there, unless it was different b/c of the light source. Sun had set so I used my cellphone flashlight. I dunno. We'll see where we're at in the morning, but hubby came home from a couple of hours of hockey this evening and said he could immediately tell the difference.
I'll test every day for the first week or so. I know I still need to add some calcium, still, but I was going to wait until Monday morning for that.