I just learned that a whatman filter was the same as pvdf-syringe or at least that is what i understand. And I think the whatman filters I used to use were .45 pore size but I am not sure.

https://www.amazon.com/Diameter-Individually-Packaged-Biomed-Scientific/dp/B073YQYC6S/ref=sr_1_4?keywords=pvdf-syringe&qid=1562191771&s=gateway&sr=8-4

https://www.amazon.com/Diameter-Indi...gateway&sr=8-3

these are different sizes which one do I need for brewing fina or if I buy unfinished products from a sponsor?

I only bought this type stuff in kits before