Inline filters. I wouldn't waste them for something like Nannochlorpsis sp., but if you are trying more demanding cultures or are recovering a rather contaminated one they do a good job keeping the culture clean for longer.
The air pumps hate it though, especially if the filters don't get replaced frequently.
I recommend vacuum cleaner bags and tetra whisper 100 air pumps. These will last much longer than syringe filters, although technically a syringe filter should be better due to smaller pore size (0.22 micron or 0.45micron).
If you are set on the syringe filter, using vacuum cleaner bags as a "pre-filter" should allow them to last longer before clogging. I did this for a long time but now I just use the vacuum cleaner bags. It seems to be good enough.
The tetra air pumps also have replaceable diaphrams that cost $15. This one I replaced just a couple weeks ago. The diaphrams in air pumps will tear eventually, leading to low/no airflow.
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, especially if the filters don't get replaced frequently.