like my first go, though I had no trouble distilling solvent, which sounds like something you neglected to do, and is rather necessary.
You sure can
and must include all
hoses when purging your system of atmosphere.
I faced this same dilemma and learned most everything I now know from Gray Wolf and this site (thanks ya'll).
Here, read this:
One major obstacle we shared was the dewaxing material column. It works too well. It's acting as a cold trap. It needs to be heated... and getting that alcohol/dry ice slurry out of it is ridiculously difficult to recover. I found it impossible, and simply too costly to waste by washing it away with hot water. So I scrapped that method for Gray Wolfs method (explained in the aforementioned link)
I also found passive slow, inefficient, problematic, and most of all costly.
I upgraded to a bidirectional active system utilizing a desiccant dryer (absolutely necessary if reusing solvent. Something BVV didn't tell you, did they?)
My first passive top fill run netted 3.1 grams per ounce (trim) and took from midday to 3am. 😥
My first bidirectional active run took less than 2 hours and netted 5.3 grams per ounce (buds). A lot of that is experience.
I lose about 0.33lbs of solvent because I like to pour off, not scrape off.
If you want to be able to run passively without spending a hundred dollars on dry ice and alcohol every time, trust me, don't fill that dewaxing sleeve with slurry. Instead, pack your column and freeze it. While it's freezing, purge your system. Leave the vacuum pump attached. Quickly assemble your column, open your ball valve and purge the added components. You cannot fill the column with solvent with the ball valve closed unless you have an alternative route for pressure. (like the overflow on bidirectional systems), it needs to be at least cracked.
IMHO spending that much money on a system and running passively is like buying a Ferrari with no motor and pushing it around. Yeah it's a Ferrari, but...