100 lbs. of cal-hypo is a lot of chlorine, considering that for your size pool you only need 4 oz of 65% of cal-hypo to boost the chlorine level by 1 ppm! Oh, well, it will last you a long time, and it keeps as long as it doesn't get wet! :-D
Do you know what your calcium hardness level is right now? That's the one thing that cal-hypo does increase. The increase is really pretty small, something like 3 ppm per pound of 65%, but if you use it as your only source of chlorine, you will eventually notice it. Even for vinyl liners you do have to make sure your calcium doesn't get extremely high, because you can get calcium scaling even on vinyl liners. But with most fill water, unless you have added calcium to your water already, you will probably be low enough CH to use your cal-hypo for quite awhile. I know I use it to shock; my fill water is around 150 - 170 ppm CH, and I haven't noticed an increase at all yet.