If you are burning wood ?
Then your flue will be building up harmful deposits of tar and creosote, major cause of chimney fires!
Improve the performance of your fireplace or wood stove by using CCL.
Use CCL when there is a noticeable creosote build-up or before mechanical cleaning.
CCL is most effective when there is enough creosote build-up.
Creosote build-up will depend on the number of fires and type of wood you burn.