Not to slow with a great flow. getting this filter you'll save some dough! - Nalge Nunc MF75 Tissue Culture Filter Units, Nylon Membrane, Sterile, NALGENE 153-0020, Case of 12

Once vacuum is started, it is best if you don't stop it, it will most likely not go back into filtering. The plastic receiver will instantly crack.. I am not sure why they waste their money supplying it with the filter itself.. getting a 45 mm neck Kimax glass receiver will fit right in.
Pros: fits many applications to be user friendly...
Cons: The bottom receiver is useless. and filter only good for one time use.

This review was written in the old system and had content requirements that are different than reviews written today.