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Re: tetrasodium ...

EDTA is a chelator. The word chelator comes from the Greek word 'chele', 
meaning claw. This is what EDTA does. It acts as a 'claw' to grab cations 
such as Fe and prevent them from precipitating out of your water. The 
interesting thing about EDTA is that unless the solubility of the cation 
in question is low (such as for Fe) then EDTA actually decreases its 
availability to the plant.
To use it, dissolve a known amount of EDTA in water and then dissolve an 
equal amount of an Fe compound such as FeCl3. The amounts used should be 
based on MOLES as EDTA binds cations (regardless of their charge) at a 1 
to 1 ratio.
One other point, EDTA degrades in the presence of light so should be kept 
in a dark bottle.