Start here.
You made it in the capna.
I suggested you filter it before you put it in the rotovap.
0.5um is “half a micron”, which is how fine a filter I prefer. I suggested you might find one hundredth of a millimeter (10microns) sufficient.
One micron, also know as a micrometer, is a thousandth of a mm, which is a thousandth of a meter. So 10-6 meters…
Google.com/search?q=Micrometer+micron
Not doing your homework before purchase often has consequences.
You’ll see a lot of capna systems for sale around here…