I ran three 200g cans of Butane through about 250g of cabbage for the first time. I was left with about a heaped teaspoon of honey oil. By the time that I was onto the last can, the Butane was coming through the filter clear. I read somewhere that this is when I should stop running the filtering process. My question is, is it pointless to run Butane through once is going through clear?

yea pretty much