Seems to be a bad batch. Our LFS has used them for years and tried to let them know where was a problem. Kent's employee tried to hide the fact and in doing so, lied to one/or more customers who had called directly -saying there was no problem and they hadn't heard anything about it.... when in fact, it was the same person who the LFS reported the problem and findings to. The LFS would have stuck with Kent if they would have handled the issue correctly. But lying to customers and trying to hide the mistake got them the boot.... all Kent products are being liquidated at 50% price and I'm pretty sure you'll not see Kent products back in the LFS again for the forseeable future.
Not sure how many hundreds of salt mix buckets/bags were affected - I've been waiting for Kent to release something on this, but.... nothing from what I've seen is showing that they are admitting any problems.
Hopefully they'll come to their senses and realize it's best to be honest and upfront... We'll see.
John.