Just like I asked in the starting post, the column was my real interest. At that 22l size the joint size, internal diameter, length, design and packing all have huge effects on reflux rate, warm up time and effective separation. But then again, we all know this. I just was hoping to gain some insight into what has effectively worked for others. No need to go through r&d and inventing the wheel, when a simple, "300mm vigreux, vac jacked in 45/50 worked for me" would do. This glass is expensive and difficult to obtain. I would rather not have to struggle unnecessarily. I have personal experience, like most here, with vigreux and hemple columns of various lengths and different packing in the hemples. I see that most of the plant scale columns are perforated plate. Are these the hot ticket? I wouldn’t know. How about oldershaw columns? Once again, I was hoping that I could just hear about what has worked for others. This is a dangerous and expensive game we play and I was just looking for some help. Sorry if the questions are ignorant.