Whatman filter question

[poppz]

I.ve seen .02 um ,,i.ve seen .22um,,are these the same but a typo on online sites or different sizes??if they are different,whats prefered on filtering.

[OdinsOtherSon]

I think 0.02 is a typo and 0.22 is preferred.

http://forums.steroid.com/faq-recipes/