It's stabilized chlorine so it has both chlorine and CYA. It will chlorinate your pool but also add to your CYA level and lower your pH. With a CYA of 48, you're on the high end of the 30-50 ppm recommendation by most on this forum so in that regard, you probably shouldn't use them.

If you do, all it means is that as your CYA creeps up, you will need to maintain a higher level of chlorine.

Peter