Those midi and maxiprep columns are designed for gravity flow only. Any attempt to speed up the flow may result in poor recovery or quality of the plasmid. Just make sure the "supernatant" is free of debris before applying onto the column. Sometimes, debris or precipitate will pass through the syringe filter if you try hard to get the last drop of supernatant. When debris appeared in supernatant, you need to centrifuge them down.
Not affiliated with any company. Mention of a specifc product does not imply my endorsement of the product. No conflict of interest or guarantee to work on the advice given. Do as I say, not as I do. Not liable to the loss of your valuable samples.