Sudden Unexplained Barb Deaths [+ General Disc'n About Water, Conditioner, Etc.]

It sounded to me like that's what Microbe believe they've done ie copied the recipe, although this info came via MA's store manager rather than directly from the manufacturer.

On the topic of water conditioners dealing with chloramine, it just so happens that a discussion took place elsewhere on this very issue yesterday, and I input my learning from this thread about the free ammonia and ammonium liberated during the chloramine bond breakage process. Several very well-renowned folk in the fishkeeping world, at least one of whom is a professional scientist, helpfully clarified that "the small amount of ammonia released by the dechlorinator breaking the chlorine/ammonia bond should be very rapidly dealt with by the filter and, in any case, is too little to register on a test kit or cause a problem" (which indeed would fit with the fact that my NH4 test always goes from 0.2-0.4 tapwater to <0.05 ppm the instant the tap water conditioner is added), and "between health filter bacteria and the fact most modern water conditioners treat tap water ammonia anyway, the chloramine to ammonia and chlorine issue is usually unimportant. It was really only relevant back when people didn't treat tap water, but instead simply allowed it to 'de gas' overnight." Hopefully this concludes the discussion on the particular issue.

Thanks, @Lynne W, but I want to honour my promise which was made before the aforementioned discussion had taken place. 

It doesn’t seem to irritate the fish, so I possibly wouldn’t call it an irritant. However, fish do a great job of producing their own mucus, and don’t need any help. They’ll only lose it if it’s literally wiped off them during very rough handling, which doesn’t usually happen at waterchanges. The concept of adding something to accelerate mucus production, every week when it’s never required at all, is a strange one to me.