Swept the chimney down today, pulled the insert out to inspect the chamber, smoke shelf, and damper area. I did this after reading the pros and cons of burning pine, I've been mixing the pine I scored from meeting Warren- with my hardwood and its been a couple of weeks, so I decided to see for myself if any creosote, tar, gunk has accumulated.l Most of you probably know from reading prior posts, that I burn with a pre EPA UL listed 1980 slammer, venting directly into the terra cotta lined masonary chimney. my stove outlets design is a 3.5X29.5 damperslide, so I have no adapted liner. I was surprised to see just the usual paper thin shiny stuff on the first 2 top tiles, I bushed her down and cleaned her out, nothing but dust! I think that pine has helped to keep my system cleaner, It sure hasnt made it any worse,, thanks Warren again, and I'll check her again in a couple weeks, some go to the gym, I sling around my 450 pound beast, with loving care!