I don't use Barbicide, but nonetheless an interesting question... mostly because there was a disturbing lack of a definitive answer when I searched the net. Perhaps this is due to the potential legal liability if someone were to follow such instructions and then become infected with something??
I did find lots of references with
rule of thumb answers -- "daily", "at least weekly" or "whenever it looks cloudy"... these didn't make me feel very secure in knowing what to do. Most regulatory agencies (health depts, etc.) deferred to "the manufacturers instructions"... for those of you who have purchased/use Barbicide, was there any instruction included with the product? Several of these sources did, however, mandate
daily changing of the solution. I also checked the manufacturer's website, but there was no relevant info... I guess you could call them and ask -- here's their contact webpage:
King Research