I have the Kodak chemicals and plan on developing my first 4x5 slides this weekend using the Jobo. The 4x5 drum needs a minimum of 230cc's of developer I think. I will probably develop 2-3 negs at a time in case I screw up and would like to know if I can re-use that 230ccs of chemical for another 2-3 negs, or toss it and use fresh.