If you extract with a propane/butane mix, at -30/40C, you will extract less of the ~C-30 longer chain molecules, so may not need to dewax.
If you are planning inline dewaxing, you need a chamber where the LPG/BHO mixture has enough residence time at low temperature, for more of the longer chain molecules to precipitate out of solution, so they can be filtered.
Try a 1 micron sock filter from Duda Diesel, and adding marbles or ball bearings, glass beads, etc, will add to the surface area that the waxes can adhere to.
