Love this site. I just took my first swim of the season in my fabulous crystal clear pool.
I have a PebbleSheen surface, and SWG for chlorine. The manual that comes with the SWG states that the pH often will stay around 7.8 with a SWG, and that has been the case with my pool. Also, the PebbleSheen seems to maintain it that way too. Now, according to the instructions on this site about SWG chemistry, it is stated that a pH from 7.4 to 7.6 is very important, but doesn't say why. I can put 2 cups of muriatic acid in my pool every weekend, but is this really necessary? My chemistry presently is otherwise just perfect as calculated on this site using my TF100 test kit. So, why is pH so important?