Technically, you can’t filter the resin out of the IPA. The only way it comes out is either with UV (aka stick it out in the sun with a clear bottle and it’ll cure and settle to bottom, or turn to a jello-like substance) or distilling (which is usually only good for businesses that are using IPA a ton, due to IPA being flammable).
If you filter it, you can get rid of some of the little particles floating around, but not the actual resin that is saturating the IPA. If you look on the forum, there’s a few people who have guides on how to distill with a cheap setup, though that comes with its own dangers.
For example: How I distill my used IPA
Also, very in-depth review, great to see it!