I have been using a 2" boka still packed with stainless pot scrubbers getting 94-95% consistently over a dozen runs, as I cant tell the quality of the scrubbers I replaced them with copper mesh. My last 2 runs I cant get above 92%. One run I think it was flooding because it was packed to tight, repacked it, seemed to run well but could not get over 92. The packed section is 1.5 m and is insulated.
Any help most appreciated