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Super Triple Phosphate

Well, I'm actually considering dosing
some phosphate because my levels are
always unmeasurable and I want to
experiment. Wisdom of that aside, might
anyone be able to help me with a few

1) Isn't Super Triple Phosphate CaH4(PO4)2?
   I can't figure out why the bag I bought
   says 46% P2O5. I can't get the molecular
   weights to figure.

2) I wonder what the significance of
   P2O5 is? I thought phosphate was PO4.

3) Are there more suitable sources for
   phosphate than CaH4(PO4)2: K2HPO4,
   KH2PO4, Ca(H2PO4)2+H2O?  Has anyone
   tried any of these?

4) There's Phosphoric Acid in Coke and
   Pepsi, maybe I should use them. Who
   knows what an SAE might do given some
   caffine and a phosphate fostered algae
   bloom!   :-)

Many thanks to any Chemists.

Tim Mullins - Pittsburgh