Believe it or not, my local grocery store no longer sells Borax (just when I need it). They did have Washing Soda, but I didn't buy it because I'm not familar with using it vs. Borax.

In general, my pool only needs to have the PH brought up when I open, after that it stays pretty steady (seems the SWG brings it up and acid rain brings it down, sweet). My TA is about 120. Given that, does it make sense to search for Borax, or should I just use the Washing Soda??