You have options. With Cal-Hypo, for every 10 ppm Free Chlorine (FC) that is added, it also increases Calcium Hardness (CH) by 7 ppm. So at normal chlorine usage rates, it will take too long to raise your CH. At 2 ppm FC per day, it's an increase of a little over 40 ppm per month. Nevertheless, it does say that you can use Cal-Hypo as a chlorine source without concern for over-saturation.

To increase CH faster, you would use Calcium Chloride. This is found in products such as Peladow, Dowflake and Tetra or you could pay more and get Calcium Hardness Increaser at a pool store (it's the same thing). You can use The Pool Calculator to calculate dosages.