I started this thread a couple weeks ago:
http://www.yorkietalk.com/forums/sho...hlight=calcium
Ca/Phos have to be balanced (some people just decide not to worry about it but it is supposedly very important). It is typically a 1.2:1 ratio and all the way up to a 2:1 ratio is acceptable.
Solid Gold does have one that is balanced but bone meal has had contamination problems in the past, so I think I'd want to use one that is fit for human consumption. KAL bone meal qualifies but I don't think there is any phos in it. Maybe Solid Gold can guarantee that theirs isn't contaminated...I don't know.
Here is the dictionary.com link for the phosphorus definition:
http://dictionary.reference.com/browse/phosphorus