I ordered PI after
having NPA and TE, and I don\'t think you need it unless you want to up the none content in products (AE, TE,
NPA).
TE/NPA seem to work better an PI is a little unnecessary unless you want more none.
APC is good for
mixing with NPA, but that is about it. It smells like cheap laundry detergent too.
NPA is the same formula as TE
but TE is more diluted.
You seem to have the four best products, and I would not rush to get anything else.
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