Why don't you just use a pair of tweezers and get them out physically? You said you only have 2? That is what I would do, I don't like chems in my tank.
...Kalk's commonly used as a calcium and alkalinity supplement in the hobby. 100% reef-safe when used properly.
I find it funny how people don't want to put 'chemicals' in their tank, but use artificial salt mixes. %)