For your pebbletec pool, like all hard-sided pools, the recommended CH level is 200-400ppm. zif you expect to be adding hard water to your pool, you MAY want to rely on that to get you to 200ppm. You can supplement your chlorine with Cal-Hypo, preferably with a content of at least 60%. it will add calcium as well.

Meanwhile, your CYA is low and your pH is on the high side so your tri-chlor tabs are perfect for lowering pH and adding CYA.

Just be sure you don't mix the two. Dangerous. Once dissolved in the water, they are safe.