EB>From what I've read Pot cannot tolerate high amounts of Aluminum in the
EB>soil.
       Hmmm.  Must be a particular aluminum salt.  Most soils contain a good 
bit of aluminum, usually bound up as extremely strange oxides incorporating 
other elements.  If I remember my highschool geophysics correctly, aluminum 
makes up 22% of the earth's crust.  Many clay types contain very high 
concentrations of aluminum oxides.
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