I am also in CA with SWG and Calcium is 520. I don't have scaling. I keep my ph in check with a good dose of muriatic acid once per week and my alk is at about 90. We got a lot of rain this winter so the salt got diluted. I was hoping the Calcium would too, but it is the same as last fall. I am thinking that a little bleach in the winter would do a lot of good...actually thinking of disconnecting the swg this coming winter since I let my water temp drop and the salt gets diluted in rainy season anyway.

Have you tried soaking your cell with muriatic acid solution?