Matches what I've learned. To get us back to PPB, none of these O2 scavengers remove polyphenols (PP). Only polyclar does and if your beers are a bit harsh and you think PP are the culprit, PPB will help. In my brewing, I found a noticeable difference using PPB. Dare I say it gives a "polish" to the beer. While there is a reduction in bitterness, it is a reduction in the harshness of the bitterness. The clarity is also a whole other level. Honestly, I care less if the beer lasts longer using it (but it does).