I have been running 1 gallon (or a bit more) through a Mini Jet. For a Super Jet I have used 6 US gallons (5 Imperial gallons). That's my interpretation of the instructions. BTW, the SJ pads are larger than MJ pads, and I think that is one erason for using more rinse water.
Instead of running water through the filter, I presoak the filter pads. Dip em into a bucket of water until they stop fizzing, then add to the filter assembly. I also measured that the 3 filter pads absorb exactly 500ml of water so I tend to dump the first 720ml of wine comming through the filter.