Well, it can be confusing.
IF your tank has a high calcium requirement, you will need to add calcium in one form or another. The one preferred by most reefers is to drip Kalk.
YES........it has to be dripped, so as to add it VERY slowly. This is due to the extremely high Ph (12) of the Kalk.
Most add it just at night, when the natural tendency for the Ph in the tank is to drop. I suppose you could then "hide" the "ugly container" during the day.
Kalk comes in a dry form, with no directions. There is where you have to do your homework. There is alot to it actually. You make a solution with RO/DI water, let it sit for several hours, and drip only the liquid ontop of a crust that settles on the bottom. You also must figure out the correct drip rate for your tank.
So, it can be confusing.
But I researched all I could and learned about it, and now am dripping away with great success.
HTH
Hermit