SN confusion

[stopmesuffering]

On a website it offers

Curing Meat Sodium Nitrite 99% bag USP Grade Food use

Or

Sodium Nitrite (Filmerine), 99.89%, Analytical Reagent (ACS)

Can anyone tell me the difference and which I should get?

 

[locked*n*loaded]

On a website it offers

Curing Meat Sodium Nitrite 99% bag USP Grade Food use

Or

Sodium Nitrite (Filmerine), 99.89%, Analytical Reagent (ACS)

Can anyone tell me the difference and which I should get?

Doesn't matter as long as the assay is >95%.