I've read several instructions on how to do the CWE. I somewhat understand how it works, but what I would like to know is how effective is it?

Say if I were to do it three or four times to the same batch, what percentage of APAP would I be removing?

It works just fine. And don't bother doing it more than once, it ain't worth it for the tiny amount of APAP you might remove.

Thanks,

I'm trying to keep my foie intact as possible.