Duraflame Flue-Renew Log is treated with Safe-T-Flue Chimney Cleaner, which reduces soot and creosote buildup. Recommended for use in all wood-burning fireplaces and wood stoves. Use 1 log/month during burn season, or 1 log every 20-30 fires. Simply place log (in wrapper) in fireplace or wood stove and light wrapper. Log and wrapper will burn to ash. Each log is one application.