I think this subject was brought up a while back, but I was reading this from the chimney Sweep Online Site. www.chimneysweeponline.com/homillends.htm What do you guys think of this? I called Woodstock and they said it's a no no. Over time the chemicals in milled wood can clog a catalyst. Oops, I've been burning saw mill lumber for a month now! What about bar oil from a chainsaw? They must put more lube on sawmill saws? Or is this all just a bunch of hoopla?