Probably your standard plate filter with 1 micron pads. The .5's strip way too much. Now that I have my vacuum pump setup I may try it again.
Wet the pads, push out the sani with beer. Discard about the first qt or 2. The hardest part is getting a proper purge on the receiving keg. I would do a Sani-purge, and hope for the best. Give the beer a few days to "settle" after. When I did that I saw flavor degradation in about a week or so.
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