2PO4(3+) + 3Ca(2+) -> Ca3(PO4)2

["Daniel Larsson" <defdac at hotmail_com>]

I need PO4 and Ca, so I dose CaCO3 and KH2PO4.

Under low and high pH levels this happens:
2PO4(3+) + 3Ca(2+) (or Mg(2+), Fe(2+) etc) -----> Ca3(PO4)2 
This would mean that some of the nutrients I dissolve in the water
will settle in the substrate by sedimentation. Substrate fertilization?

From 
http://ic.ucsc.edu/~wxcheng/envs161/Final_rev02_spring.htm
(Phosphorus (P) section)

Someone please explain.


// Daniel