It is available in some areas, but I do not know about San Jose.
Due to hard water in San Diego and replacement of evaporated water, in the course of less than 2 years, my CH went from 500 to 1100.
I am very familiar with those calcium chips you show in your pictures. Until I got the reverse osmosis treatment, I had to acid clean the SWG every 4 to 6 weeks, and be very aggressive about keeping the pH in the 7.2 to 7.4 range. Anything higher would start scaling, and if I let it drift to 7.8, scaling was a sure thing. I kept my TA around 60, I added a bit of acid every other day to keep the pH in control. With the SWG pushing pH up, it was a constant battle.
No after Reverse Osmosis, I can relax again. Adding acid only once a week now as the pH settles in the 7.6 range wtih TA 70. After RO, CH was 200. I will slowly let this creep up again, realizing ideal is to be at 250. But I am not about to add Calcium unless someone tells me I am in real danger at 200 and watching the numbers as it will inevitably drift up again. If you can find Pool RO in your area, go for it. In the meantime, get your TA down, and keep the pH aggressively controlled. Your only other alternative is to drain and refill. (of course you could hope for lots of rain, but we both know what that chance of that is in San Jose (or San Diego) June through October).