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Re: USP grade

Roger Miller wrote:

"If you are concerned about the impurities then it
would be
better to use a USP grade product rather than an
agricultural product."

Roger, what is a USP grade product.  I may need a
phosphate source.  USP?  United States Pangolin? 
Unsatisfactory Senile Person?  Ultra Size *****?  

Thanks, Cavan 

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