Wondro hasn't been marketed since the early 1950's and it is only recently that it has been demonstrated that it can be safely made in the kitchen in single dosage quantities (see "Astrophysiology and Yeast -- Wondro For One"). I have tested this and tried it but am currently using the "Astrophysiology and Yeast -- Yeast Abatement Protocol" which is a combination of homeopathics and supplements with timed-released N-Acetyl-L-Cysteine ("Resbid") as the acetaldehyde scavenger. This appears to work but the historical success of Wondro in light of the acetaldehyde connection makes it yet another option if problems arise.