From http://www.woodheat.org/qa-maintenance.html
Q&A About Maintenance
Do chimney powders work? Are there any dangers?
How effective are creosote powder cleaners? The brand I have is [****], and the active ingredient is cupric chloride. Are there any dangers to the use of this material, and are the ashes of concern as far as toxicity is concerned?
Thanks for your help, James
Hi James,
Here is an excerpt from the Wood Energy Technical Training reference manual, part of the Canadian training and certification system for wood heat technicians and inspectors:
" Chloride-based powders, containing copper, zinc, or other metals, are the oldest form of chimney chemical. The active ingredients in these powders are the heavy metals and chlorides which have the corrosive qualities of salt. Chloride-based powders are effective only at high temperatures, so they are sprinkled on an intense fire. Tests have shown that this form of anti-creosote powder is not particularly effective and the chloride-based powders attack steel and cast iron. Therefore, chloride-based powders are not recommended."
I would also point out it has been found more recently that the combustion of organic materials (like wood) in the presence of chlorines/chlorides, such as salt, bleach, plastics and so on, promotes the formation of the toxic pollutants dioxin and furan.
The best way to remove chimney deposits is through brushing. If deposits form quickly or are difficult to remove, the problem is fuel quality and firing technique.
If you really must use a chemical treatment, look for manganese based liquids. They actually work somewhat if used correctly.
John
Q&A About Maintenance
Do chimney powders work? Are there any dangers?
How effective are creosote powder cleaners? The brand I have is [****], and the active ingredient is cupric chloride. Are there any dangers to the use of this material, and are the ashes of concern as far as toxicity is concerned?
Thanks for your help, James
Hi James,
Here is an excerpt from the Wood Energy Technical Training reference manual, part of the Canadian training and certification system for wood heat technicians and inspectors:
" Chloride-based powders, containing copper, zinc, or other metals, are the oldest form of chimney chemical. The active ingredients in these powders are the heavy metals and chlorides which have the corrosive qualities of salt. Chloride-based powders are effective only at high temperatures, so they are sprinkled on an intense fire. Tests have shown that this form of anti-creosote powder is not particularly effective and the chloride-based powders attack steel and cast iron. Therefore, chloride-based powders are not recommended."
I would also point out it has been found more recently that the combustion of organic materials (like wood) in the presence of chlorines/chlorides, such as salt, bleach, plastics and so on, promotes the formation of the toxic pollutants dioxin and furan.
The best way to remove chimney deposits is through brushing. If deposits form quickly or are difficult to remove, the problem is fuel quality and firing technique.
If you really must use a chemical treatment, look for manganese based liquids. They actually work somewhat if used correctly.
John
