LOL, just like anything, ANYTHING AT ALL
there will be from time to time bad batches of salt, recalls on car parts, flaws in stereos, even in food products which we consume.
on GREAT AND PROVEN PRODUCTS. It does happen. And Thomas's tank is established, however form what he said the problems were noticable before he added the water to the tank. So testing and observation(as we should do) would alleviate any problems.
as for using a different brand, I like and use IO and so do many others. Is it possible there was a problem with a certain batch?? YES(if not this one in question, i am sure there was at least one or 2 since they started), it happens in manufaturing all the time. Would it scare me? NO, as I said it happens, and could just as likely happen with ANY OTHER BRAND. Including Reef Crystals, which for the record is made at the same place, with the same recipe except they add more trace elements. Now there are certain brands which I do not use or like at all because I do not like their "RECIPE" and have not liked teh results in one way or another, NOT because of one instance where there were a few problems but because of long term unsatisfying results.