But this was the worst swimming season in 10 years. We swam far less, there was far too much rain, and even the chemistry changed.

I almost NEVER use Tri-Chlor pucks--but this season I did. With all the rain washing out the CYA and chlorine, I took to using one or two floaters to try to compensate. It helped and kept me from all but one early season bloom. But I barely kept CYA at minimal levels.

But I had to add far more Borax and Washing Soda as well to get the pH back up and raise the TA.