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There's no mention of this on the box. We have used it with our stainless steel flue for several years and all seems to be ok so far. can't comment on the effects of long term use I'm afraid.
how often should these be used 18 Sep 2014
It depends on how bad your flue or chimney is , we sweep our lining for our wood burner before winter then use one at least once a week.If the fire seems really smokey then we have used twice a week. They are quite expensive but they do the job well and we have seen a good result.
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