Hello everyone,

I'm performing ultrafiltration on a growing media, previously filtered at 0,2 um, using 5kDa polyethersulfone filters (Biomax, EMD Millipore Corporation) and a vacuum pump (500-600 mbar). Unfortunately, the process seems to be quite slow. Is there anything I can do to speed up the process? Have others experienced a similar problem?

Following the manual, I activated the filter by placing it on Milli-Q water for one hour (with water changes) before using it.

If anyone has any ideas about what could be wrong and how to fix it, I would be grateful for any advice :)

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