Filtering with a t-shirt will remove most of the bark particles, but not the really small ones. These would probably still clog a sep funnel. You would have to let it sit overnight so the really fine sediment could settle to the bottom first, then decant or siphon the liquid off being careful not to disturb the sediment on the bottom.
I'm not sure at which point in the process MM is suggesting that you filter your solution, but I don't know if I'd recommend filtering a basified bark solution... Many standard A/B teks recommend doing acid boils, then filtering, then adding base. Filtering that much caustic solution would leave a lot of room for error, and that's not a mess I would want to clean up.
Glass turkey basters work great, but a step up from them would probably be glass-on-glass syringes. They are often sold for industrial uses and I would probably recommend getting a larger one (50mL or so) for getting most of the solvent, then a smaller one (5-10mL or so) for getting that last little bit.
Also Mason/Ball jars work great, but I would recommend getting some
BPA-free lids rather than using the lids that come with the jars.
EDIT:
arcologist wrote:If you can get a glass syringe you can siphon off the layer of naphtha in a very controlled manner and get all but maybe 1 or 2 mm of the layer. This is my preferred method. The turkey baster can be hard to control and a separatory funnel can clog or be unwieldy/dangerous/expensive. With the syringe you aren't pouring any caustic liquid that might spill and cause burns.
Your post wasn't there yet when I loaded this page... Great minds think alike
