Which sources of calcium should i use? And where from?? :S

[moonsful]

So i have Paphiopedilum bellatulum and I was wondering how to add calcium to the medium. They like limestone or chalk but can I use something else, since I cant get hold of any of them, unless someone knows any stores that sell them. Which fertiliser contains calcium?
Any advice? )

[moonsful]

does anyone know if i could use crushed egg shells in the medium do add some calcium? has anyone tried it?

[billc]

MSU fertilizer has calcium it it. You can also top dress your media with oyster shell, which I believe is available in stores like PetSmart. You can also use Calmax which has calcium and magnesium in it. MSU fertilizer is probably the easiest way to introduce the calcium. First Rays has it.

Bill

[moonsful]

Thanks