I tried to get a 10 inch water filter and vacuum pump setup working, but I was never successful. I finally figured out that the threads on the filter housing I bought were not straight cut, but were beveled such that water pressure inside would push it out and help to seal it. A vacuum on the inside separates the threads and just guarantees an air leak. I'm using that filter housing now with a charcoal filter for my espresso machine supply line, and it's working fine in that application.
I finally broke down and bought a Buon Vino Superjet about a year ago. It works, but there are things about it that I definitely don't like. You have to pump sanitizer and then plain water through it before you can siphon your wine. Then when you start siphoning your wine, it mixes with the water at first so you end up wasting some of your wine because you can't really tell for sure when you are getting just wine. It's difficult with red, even moreso with white wine. Then if you filter multiple carboys of different wines, which is the only way you can really use the Buon Vino economically because of the filter cost and the waste, you end up getting some mixing at the end of one carboy and the beginning of the next. So your final wines aren't really pure.
I think I'm going to go back to the 10 inch filter housing or the filter in a PVC pipe approach if I can get it sorted out, and sell the Buon Vino.
I'm hoping that it was a one gallon carboy that we would not be asking about.
