</font><blockquote><font
class=\"small\">Quote:</font><hr />
I have most products but no PI. What is the advantage of having it in
comparison to NPA? PI is more none concentrated. It just seems to me that PI\'s cost is not justifiable. I\'d
appreciate hearing some pro PI opinions.
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PI hasn\'t done much
for me but i vaulable if you want to up the none level. If you can\'t afford it, I say go PPA, which is only none
to, stone labs, not highly concentrated, but no apc.
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