Home Depot Max Melt for calcium

Any objections to using this for calcium?
What’s it say are the ingredients/purity?

Edit: didn’t see the “100% pure” note there. Should be ok as long as that’s not just a marketing term. What’s your calcium level now? Most people don’t really need to raise the calcium level.
 
The internet didn't give up any information at all about it. Not showing on the Home Depot site. So kind of suspect. Some brands include a listing of the actual chemical compositions. If there is a manufacturer listed, you may be able to google their site, and get to the required MSDS info, that should give more details about how pure it really is, what else is in it, etc.

Totally 100% pure is VERY expensive (lab/food quality). Most (even pool stores) are between 84% and 97%. The remainder is mostly sodium chloride and other salts, residue from the refining process. Not to be confused with blends, that have a LOT of stuff we don't want added.

In my case, my community actually softens the water for all residents (!) Being vinyl, I usually don't care. But will be adding CH this year, so that I get the water perfect for the coming new heater warranty...at least initially.
 
I had to partially drain my ~35,000 gallon pool this year to install new diverter valves so everything was low. Started at 100 & is now 167 after adding 50 lbs. It's almost 4X cheaper to use this than pool store calcium. This is what my local store had in stock when I actually asked for another variant that their web site showed was in stock. Just searched for calcium chloride. I decided to pursue this after reading the TFP Pool Care Basics, Recommended Pool Chemicals for alternatives.