I filtered a Cellar Craft Showcase Old Vine Zinfandel today. After a crawling 2.5 hours I pulled the plug and had to top off with 1.5 bottles of another. Again I see no real visible sediment in the filter and no tears. Did I take a huge risk letting that Zin sit exposed to O2 for 2.5 hours? I added 1/4 teas of SO2 mid process to help. It was due anyway.